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General Science for SSC CGL : 2000 Important Questions of Science for CGL & CHSL Part-1

General Science for SSC CGL : 2000 Important Questions of Science for CGL & CHSL Part-1

Dear Aspirants,

This Article contains General Science Important Questions for CGL, CHSL and Others SSC Exams. General science is part of the General Awareness section of SSC CGL Tier-1 examination. It includes questions on Physics, Chemistry & Biology. Practice these Questions well and take test to keep Yourself at par with your Competition.

You can access Important Notes for General Science i.e. Physics, Chemistry and Biology on our website.

We also provide the PDF solution and video solution for each & every previous year paper of SSC CHSL & SSC CGL, both Tier 1 and Tier 2 on our website.

We hope this will be helpful in your Examination.

 

SSC CGL General Science 2000 Important Questions
Q1. Optical fibre works on which of the following principle of light?

प्रकाशीय तंतु निम्नलिखित में से प्रकाश के किस सिद्धांत पर कार्य करता है?

(a) Reflection / परावर्तन

(b) Refraction / अपवर्तन

(c)  Diffraction / विवर्तन

(d)Total internal reflection / पूर्ण आंतरिक परावर्तन

Q2. Which one of the following is a bad Thermal Conductor?

निम्नलिखित में से कौन सा बुरा ऊष्मा परिचालक है?

(a)Aluminium / एल्युमीनियम

(b)Copper / ताम्बा

(c)Glass / शीशा

(d)Silver / चांदी

Q3. Rusting is _____.

जंग लगना _______है |

(a)Electrolysis / विध्युत अपघटन

(b)Oxidation / ऑक्सीकरण

(c)Redox reaction (Oxidation and Reduction) / रेडॉक्स अभिक्रिया (ऑक्सीकरण और अपचयन)

(d)Reduction / अपचयन

Q4. Which amongst the following is not a Cation?

निम्नलिखित में से कौन सा एक घनयन नहीं है?

(a)Aluminium ion / एल्युमीनियम आयन

(b)Copper ion / कॉपर आयन

(c)Sulphate ion / सलफेट आयन

(d)Zinc ion / जिंक आयन

Q5. In a majority of flowering plants, out of the four megaspores, what is the ratio of functional and degenerate megaspores?

अधिकांश पुष्पी पादपों में चार गुरुबीजाणियों में से, कार्यशील और अपविकसित गुरुबीजाणियों का अनुपात क्या होता है?

(a)2:2

(b)1:3

(c)3:1

(d)4:0

Q6. The body of all complex animals consist of only _______ basic types of tissue(s).

सभी जटिल प्राणियों का शरीर केवल ______प्रकार के आधारभूत ऊतकों का बना हुआ है |

(a)4000

(b)400

(c)40

(d)4

Q7. What is the SI unit of pressure?

दाब के एस.आई मात्रक को क्या कहते हैं?

(a)Newton / न्यूटन

(b)Weber / वेबर

(c)Pascal / पास्कल

(d)Henry / हेनरी

Q8. Haemoglobin is an important component of _______.

हीमोग्लोबिन_______का मुख्या घटक है |

(a)White Blood Cell / श्वेत रक्त कोशिकाएं

(b)Red Blood Cell / लाल रक्त कोशिकाएं

(c)Plasma / प्लाज्मा

(d)All options are correct / सभी विकल्प सही हैं

Q9. Anaemia is caused because of deficiency of which of the following?

निम्नलिखित में से किस की कमी के कारण अनीमिया होती है?

(a)Cobalt / कोबाल्ट

(b)Iron / लोहा

(c)Sodium / सोडियम

(d)Calcium / कैल्शियम

Q10. Why does a black board appears black in colour?

एक श्यामपट्ट रंग में कला क्यों दिखाई देता है?

(a)It reflects black colour / वह कला रंग प्रतिविम्बित करता है

(b)It absorbs black colour / वह कला रंग अवशोषित करता है

(c)It reflects all colours / वह सारे रंग प्रतिविम्बित करता है

(d)It absorbs all the colours / वह सारे रंग अवशोषित करता है

Q11. What is dry ice?

सूखी बर्फ या ड्राई आइस क्या है?

(a)Solid Carbon dioxide / ठोस कार्बन डाइऑक्साइड

(b)Solid Nitrogen dioxide / ठोस नाइट्रोजन डाइऑक्साइड

(c)Solid Sulphur dioxide / ठोस सल्फर डाइऑक्साइड

(d)Solid Water / ठोस जल


Q12. Who discovered bacteria?

जीवाणु की खोज किसने की थी?

(a)Antonie Ven Leeuwenhoek / एंटोनी वॉन लूवेन्हॉक

(b)Robert Brown / रोबर्ट ब्राउन

(c)Robert Hook / रोबर्ट हुक

(d)Robert Koch / रोबर्ट कोच

Q13. What is the name of a group of similar cells performing a specific function?

एक विशेष कार्य करने वाले समान कोशिकाओं के समूह को क्या कहते हैं?

(a)Tissue / ऊतक

(b)Organ / अंग

(c)Organ system / अंग तंत्र

(d)Cellular organization / कोशिकीय संरचना

Q14. Plant tissues are of how many types?

पौधों के ऊतक कितने प्रकार के होते हैं?

(a)3

(b)2

(c)5

(d)6


Q15. It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

स्वतंत्र रूप से लटके हुए लड़की के एक ढांचे में कील ठोकना कठिन होता है | कौन सा नियम इस कथन का समर्थन करता है?

(a)Law of inertia / जड़ता का नियम

(b)Newton’s second law / न्यूटन का दूसरा नियम

(c)Newton’s third law / न्यूटन का तीसरा नियम

(d)Pascal’s law / पॉसकल का नियम

General Science
Q16. Which one of the following is not a property of electromagnetic waves?

निम्नलिखित में से कौन सा विध्युत चुम्बकीय तरंगों का गुण नहीं है?

(a)Electromagnetic waves do not show interference and diffraction /विध्युत चुम्बकीय तरंगें व्यतिकरण तथा विवर्तन नहीं दिखाती है |

(b)Oscillating electric field and magnetic field are perpendicular to each other/ विध्युत तथा चुम्बकीय क्षेत्र एक दुसरे के लम्बरूप होते हैं |

(c)Electromagnetic waves are transverse waves/ विध्युत चुम्बकीय तरंगे अनुप्रस्थ तरंगे होती हैं |

(d)Electromagnetic waves do not require a medium to propagate./ विध्युत चुम्बकीय तरंगों को आगे बढ़ने के लिए किसी माध्यम की आवश्यकता नहीं होती |

Q17. Red rot is a disease caused to which of the following plant?

लाल सरांध (रेड रौट) बीमारी निम्नलिखित में से किस पौधे को होती है?

(a)Paddy / धान

(b)Sugarcane / गन्ना

(c)Mustard / सरसों

(d)Wheat / गेंहू

Q18. Which among the following is not a connective tissue?

निम्नलिखित में से कौन एक संजोयी ऊतक नहीं है?

(a)Blood / रक्त

(b)Bone / अस्थि

(c)Skin / त्वचा

(d)Cartilage / स्नायु (अस्थि बंधान तंतु)

Q19. Which of the following micro-organism causes diseases like polio and chicken pox?

निम्नलिखित में से कौन से सुक्ष्मजीवी पोलियो तथा चेचक (चिकन पोच्क्स) जैसी गंभीर बिमारियों के कारण हैं?

(a)Bacteria / बैक्टीरिया

(b)Protozoa / प्रोटोजोआ

(c)Algae / शैवाल

(d)Virus / विषाणु

Q20. What is the SI unit of frequency?

आवृति का एस.आई मात्रक क्या है?

(a)Newton / न्यूटन

(b)Watt / वाट

(c)Farad / फैराड

(d)Hertz / हर्टज़

Q21. Which of the following are longest cells of human body?

निम्नलिखित में से कौन सी मानव शरीर की सबसे बड़ी कोशिकाएं हैं?

(a) Pancreatic cells / अग्नाशय कोशिकाएँ

(b) Epethelial cells / उपकला कोशिकाएँ

(c) Nerve cells / तंत्रिका कोशिकाएँ

(d) Epidermal cells / अधिचर्मिक कोशिकाएँ

Q22. Which of the following is responsible for giving colour to human skin?

निम्नलिखित में से कौन मानव त्वचा को रंग प्रदान के लिए उत्तरदायी है?

(a) Luciferin / लूसिफेरिन

(b) Haemoglobin / हीमोग्लोबिन

(c) Flavonoids / फ्लवोनोइड्स

(d) Melanin / मेलेनिन

Q23. Which of the following disease is non-communicable in nature?

निम्नलिखित में से कौन सी बीमारी असंक्रामक प्रवृति  की है?

(a) Cholera /  हैज़ा

(b) Chicken-pox / चेचक

(c) Tuberculosis / क्षय रोग

(d) Cancer / कर्क रोग

Q24. Electric Motor converts _____ energy to mechanical energy

विद्युत् मोटर_______ऊर्जा को यांत्रिक ऊर्जा में बदलता है |

(a) sound / ध्वनि

(b) mechanical / यांत्रिक

(c) chemical / रसायनिक

(d) electrical / विद्युत्

Q25. What are the two kinds of Rotatory motion?

घूर्णन गति के दो प्रकार कौन है?

(a)Spin and Vibrational motion / स्पिन और कम्पन गति

(b)Spin and Orbital motion / स्पिन और कक्षीय गति

(c)Spin and Translatory motion / स्पिन और रूपांतरित गति

(d)Spin and Projectile motion / स्पिन और प्रक्षेप्य गति

Q26. What is the SI unit of Force?

बल का एस.आई मात्रक क्या है?

(a)Pascal / पास्कल

(b)Boyle / बॉयल

(c)Newton / न्युटन

(d)Watt / वाट

Q27. Auxiliary bud develops into which of the following part of the plant?

निम्नलिखित में से पौधे के किस भाग में कक्षीय कली विकसित होती है?

(a)Fruit / फ़ल

(b)Leaf / पत्ती

(c)Branch / शाखा

(d)Roots / जड़ें

Q28. Xylem helps in transportation of which of the following?

जाइलम, निम्नलिखित में से किस परिवहन में सहायता करता है?

(a)Food / भोजन

(b)Water / पानी

(c)Nutrients / पोषक तत्व

(d)Both food and Water / भोजन तथा पानी दोनों

Q29. Who proposed five kingdom classification?

पञ्च जगत वर्गीकरण का प्रस्ताव किसने दिया था?

(a)Earnst Mayr / अर्नस्ट मेयर

(b)R.H Whittaker / आर. एच. व्हिटेकर

(c)M. W. Beijerinck / एम. डब्लू. बेजेरिनक

(d)D. I. Ivanovsky / डी.आई. इवानोवास्की

Q30. What is the other name of Galileo’s law of falling bodies?

गैलेलियो क गिरते शरीर के नियम को और किस नाम से जाना जाता है?

(a)Law of motion / गति का नियम

(b)Newton’s first law / न्यूटन का पहला नियम

(c)Newton’s second law / न्यूटन का दूसरा नियम

(d)Newton’s third law / न्यूटन का तीसरा नियम

Q31. Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

निम्नलिखित में से कौन सा यन्त्र धातू भट्टीओं के अंदर के तापमान को मापने के लिए सबसे उचित है?

(a)Pyrometer / पाईरोमीटर

(b)Thermocouple / थर्मोकपल

(c)Thermometer / थर्मामीटर

(d)Thermistor / थर्मिस्टर

Q32. Which of the following device is used to measure humidity?

निम्नलिखित में से कौन सा यन्त्र का प्रयोग आद्रता मापने के लिए किया जाता है?

(a)Hydrometer / द्रव्घनत्वमापी

(b)Hygrometer / आद्रतामापी

(c)Psycho Meter / मनोमान्मापी

(d)Anemometer/ पवनवेगमापी

Q33. Which of the following disease is caused by female Anopheles mosquitoes?

निम्नलिखित में से कौन सी बीमारी मादा अनाफलीज मच्छर के कारन होती है?

(a)Chicken Pox / चेचक

(b)Malaria / मलेरिया

(c)Black fever / काला ज्वर

(d)Cholera / हैजा

Q34. Which part of the plant gives us saffron?

पौधे का कौन सा भाग केसर देता है?

(a)Roots / जड़े

(b)Petals / पंखुरियां

(c)Stem / तना

(d)Stigma / रंध्र (स्टिग्मा)

Q35. Which of the following transports water from the roots of the plants to its leaves?

निम्नलिखित में से कौन पौधे की जड़ो से उसके पत्तियों तक जल पहुचाता है?

(a)Xylem / दारू (जाईलेम)

(b)Phloem / वल्कल (फ्लोएम)

(c)Both Xylem and Phloem / दारू (जाईलेम) तथा वल्कल (फ्लोएम) दोनों

(d)Cortex / तने अथवा जड़ का आवरण

Q36. Which of the following is not a vector quantity?

निम्नलिखित में से कौन एक सदिश मात्र नहीं है?

(a)Momentum / आवेग

(b)Displacement / विस्थापन

(c)Torque / बलाघूर्ण (टार्क)

(d)Speed / गति

Q37. At what temperature (in farhenheit) pure water freezes?

शुद्ध जल किस तापमान (फारेनहाईट में) पर जम जाता है?

(a)32

(b)0

(c)48

(d)37

Q38. Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?

निम्नलिखित में से सूर्य तथा पृथ्वी से विकरित ऊष्मा के अवशोषण के लिए सबसे आवश्यक क्या है?

(a)Carbon dioxide / कार्बन डाइऑक्साइड

(b)Oxygen / ओक्सीजन

(c)Carbon monoxide / कार्बन मोनोऑक्साइड

(d)Nitrogen / नाइट्रोजेन

Q39. Which among the following has segmented body?

निम्नलिखित में से किसका शरीर सर से पूँछ तक खंडित रहता है?

(a)Phylum Mollusca / मोल्स्का (चुर्नप्रवार) जाति

(b)Phylum Arthopoda / संधिपाद जाति

(c)Phylum Annelida / वलियन जाति

(d)Phylum Coelenterata / आन्तरगुही (निडेरिया) जाति

Q40. Synapse gap is present between which of the following?

निम्नलिखित में से किसके मध्य सिनेप्स अंतराल शामिल होता है?

(a)Two neurons / दो तंत्रिका कोशिका

(b)Brain and Spinal Cord / मश्तिष्क तथा मेरुरज्जु

(c)Two Kidneys / दो गुर्दे

(d)None of these / इनमे से कोई नहीं

Q41. Blood Circulation was discovered by?

रक्त परिसंचरण की खोज ____द्वारा की गई थी|

(a)Mary Anderson / मेरी एंडर्सन

(b)Virginia Apgar / वर्जीनिया एप्पगार

(c)William Harvey / विलियम हार्वे

(d)Robert Feulgen / रोबर्ट फ्युलज़ेन

Q42. Which organ has finger like outgrowths which are called as Villi (Singular Villus)?

कौन से अंग पर ऊँगली क समान उभरी हुई संरचनाएं होती हैं, जिन्हें दीर्घ रोम तथा रसांकुर कहते हैं?

(a)Large Intestine / बड़ी आंत

(b)Bladder / मूत्राशय

(c)Small Intestine / छोटी आंत

(d)Stomach / पेट

Q43. Which of the following is not a vector quantity?

निम्लिखित में से कौन सा एक सदिश मात्रा नहीं है?

(a)Acceleration / त्वरण

(b)Electric current / विद्युत धारा

(c)Force / बल

(d)Velocity / सवेग

Q44. – The phenomena of raising the outer edge of the curved roads above the inner edge to provide necessary centripetal force to the vehicles to take a safe turn is called _____.

वाहनों को सुरक्षित मोड़ लेने के लिए आवश्यक केंद्रीय बल प्रदान करने हेतु किसी घुमावदार सड़क के बहरी किनारे से ऊपर करने की प्रक्रिया को __________कहते हैं |

(a)banking of roads / ढालू सड़क (सड़क की बैंकिंग)

(b)cornering of roads / सड़क की कोर्नेरिंग

(c)elevation of roads / सड़क को ऊंचा करना

(d)tempering of roads / सड़क की टेंपरिंग

General Science
Q45. What are isobars?

सम्भारिक क्या होते हैं?

(a)Elements with same atomic number but different mass number / ऐसे तत्व जिनकी परमाणु संख्या समान होती है लेकिन द्रव्यमान भिन्न होता है

(b)Elements with different atomic number but same mass number / ऐसे तत्व जिनकी परमाणु संख्या भिन्न होती है लेकिन द्रव्यमान समान होता है

(c)Elements with different atomic number and different mass number / ऐसे तत्व जिनकी परमाणु संख्या भिन्न होती है तथा द्रव्यमान भिन्न होता है

(d)Elements with same atomic number and same mass number / ऐसे तत्व जिनकी परमाणु संख्या समान होती है तथा द्रव्यमान समान होता है

Q46. Cattle quickly swallow grass and store it in their __________.

मवेशी घास निगलने के उपरांत उसे_________में संगृहित करते हैं?

(a)Rumen / प्रथम आमाशय

(b)Esophagus / भोजन-नलिका

(c)Small intestine / छोटी आंत

(d)Salivary glands / लार ग्रंथिया

Q47. Which of the following carries oxygen to various parts of human body?

निम्नलिखित में से कौन सा मानव शरीर के विभिन्न अंगों का ऑक्सीजन वाहक है?

(a)Red blood cells / लाल रक्त कोशिकाएं

(b)White blood cells / श्वेत रक्त कोशिकाएं

(c)Plasma / प्लाज्मा

(d)Nerves / तंत्रिकाए

Q48. Which of the following function is performed by the kidneys in the human body?

मानव शरीर के गुर्दे इनमे से कौन सा कार्य करते हैं?

(a)Excretion / उत्सर्जन

(b)Respiration / श्वासन

(c)Digestion / पाचन

(d)Transportation / परिवहन

Q49. The bending of light when it passes around a corner or a slit is due to ______.

जब प्रकाश किसी किनारे या किसी दरार से गुजरती है, तो ________की वजह से वंकित हो जाति है |

(a)reflection / प्रतिविम्ब

(b)refraction / अपवर्तन

(c)diffraction / विवर्तन

(d)total internal reflection / पूर्ण आतंरिक प्रतिविम्ब

Q50. What is the reason for formation of Mirage in desert?

मरुस्थल में मरीचिका या मृगतृष्णा बनने का मुख्य कारण क्या है?

(a)Refraction of light / प्रकाश का अपवर्तन

(b)Reflection of light / प्रकाश का प्रतिविम्ब

(c)Total internal reflection of light / प्रकाश का पूर्ण आतंरिक प्रतिविम्ब

(d)Both Refraction and Total internal reflection of light / प्रकाश का अपवर्तन तथा पूर्ण आतंरिक प्रतिविम्ब दोनों

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Light-theory Physics-day-4 Target ssc cgl 2018 tier 1

Light-theory Physics-day-4 Target ssc cgl 2018 tier 1

LIGHT

Light is a form of energy which is propagated as electromagnetic waves. Light travels along a straight line. Light exhibits two natures (dual nature)

  • Particle nature ….light is regarded as a packet of energy which are known as photons.
  • Wave nature….light is regarded as an electromagnetic wave. Since electromagnetic waves are transverse in nature, thus light is also a transverse wave.

REFLECTION OF LIGHT

Mirror changes the direction of light that falls on it. This change of direction by a mirror is called reflection of light.

In reflection, the medium of the travelling light does not changes.

Laws of reflection

  1. The incident ray, reflected ray and normal to the reflecting surface, all lie on the same plane.
  2. Angle of reflection is equal to the angle of reflection.

Reflection from plane mirror

  • Inverted, equal size to the object and virtual image is formed.
  • Image is equidistant from the mirror as the object.

Light-theory
PLAYING WITH SPHERICAL MIRRORS

  • The most common example of a curved mirror is a spherical mirror. If the reflecting surface of a spherical mirror is concave, it is called a concave mirror. If the reflecting surface is convex, then it is a convex mirror.
  • Concave mirrors always forms real and inverted images except when the position of the object is between the focus and the pole.
  • As the distance of the object from the concave lens is reduced, the size of the image increases. Size of image and the object is same at the centre of the curvature.
  • Convex mirrors always form virtual and erect images. As the distance of the object from the convex lens is reduced, the size of the image increases.

REFRACTION OF LIGHT

When a ray of light travels from one medium to another, it deviates from its path. This phenomenon in which the path of light changes when it travels from one medium to another medium of different refractive index is known as refraction of light.

Laws of refraction

  1. The incident ray, reflected ray and normal to the reflecting surface, all lie on the same plane.
  2. For a particular colour of light, the ratio of angle of incidence and the angle of refraction is always constant. This law is also known as Snell’s law.

Critical angle

When a light propagates from denser to rarer medium, the angle of incidence for which the angle of refraction is 900 is called critical angle.

Total Internal Reflection

When the angle of incidence is greater than the critical angle, the ray returns back to its own medium. This phenomenon is known as total internal reflection.

Refraction of light through lens

You might have seen a magnifying glass. It is used to read very small print. You might have also used it to observe the body parts of a cockroach or an earthworm. The magnifying glass is actually a type of a lens. Those lenses which feel thicker in the middle than at the edges are convex lenses. Those which feel thinner in the middle than at the edges are concave lenses. Notice that the lenses are transparent and light can pass through them. It is dangerous to look through a lens at the sun or a bright light. You should also be careful not to focus sunlight with a convex lens on any part of your body. A convex lens converges (bends inward) the light generally falling on it. Therefore, it is called a converging lens. On the other hand, a concave lens diverges (bends outward) the light and is called a diverging lens , the image formed by a concave lens is always virtual, erect and smaller in size than the object.

SUNLIGHT— WHITE OR COLORED?

There are seven colors in a rainbow, though it may not be easy to distinguish all of them. These are — red, orange, yellow, green, blue, indigo and violet. White light consists of seven colors? You might have seen that when you blow soap bubbles, they appear colorful. Similarly, when light is reflected from the surface of a Compact Disk (CD), you see many colors. On the basis of these experiences, could we say that the sunlight is a mixture of different colors?

What you have learnt

  • Light travels along straight lines.
  • Any polished or a shining surface acts as a mirror.
  • An image which can be obtained on a screen is called a real image.
  • An image which cannot be obtained on a screen is called a virtual image.
  • The image formed by a plane mirror is erect. It is virtual and is of the same size as the object. The image is at the same distance behind the mirror as the object is in front of it.
  • In an image formed by a mirror, the left side of the object is seen on the right side in the image, and right side of the object appears to be on the left side in the image.
  • A concave mirror can form a real and inverted image.
  • When the object is placed very close to the mirror, the image formed is virtual, erect and magnified.
  • Image formed by a convex mirror is erect, virtual and smaller in size than the object.
  • A convex lens can forms real and inverted image. When the object is placed very close to the lens, the image formed is virtual, erect and magnified. When used to see objects magnified, the convex lens is called a magnifying glass.
  • A concave lens always forms erect, virtual and smaller image than the object.
  • White light is composed of seven colours.

Light-theory
 

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Force-pressure-mcqs Physics-day-3 Target ssc cgl 2018

Force-pressure-mcqs Physics-day-3 Target ssc cgl 2018

Q1. A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

  1. Outward pull on him
  2. Inertia of motion
  3. Change in momentum
  4. Change in acceleration

Q2. When a running car stops suddenly, the passengers tends to lean forward because of:

  1. centrifugal force
  2. inertia of rest
  3. inertia of motion
  4. gravitational force

Q3. A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

  1. Outward pull on him
  2. Inertia of motion
  3. Change in momentum
  4. Change in acceleration

Q4. An athlete runs before long jump to get advantage on

  1. Inertia of motion
  2. Frictional force
  3. Moment of a force
  4. Principle of moments

Force-pressure-mcqs
Q5. In which book the father of physics established the laws of motion?

  1. Principlem
  2. Pricipia
  3. Pricpiples of physics
  4. None of the above

Q6. Pressure Cooker cooks faster because

  1. boiling point decreases with rise of pressure
  2. it cooks the food at low pressure
  3. higher temperature is attained for cooking
  4. the material of the cooker is a good conductor

Q7. Newton’s first law of motion gives the concept of

  1. energy
  2. work
  3. momentum
  4. inertia

Q8. The spokes used in the wheel of a bicycle increase Its

  1. Moment of inertia
  2. Velocity
  3. Acceleration
  4. Momentum

Q9. The temperature of boiling water in a steam engine may be high because:

  1. there are dissolved substances in water
  2. there is low pressure inside the boiler
  3. there is high pressure inside the boiler
  4. the fire is at very high temperature

Q10. Why is it difficult to breathe at higher altitudes?

  1. Due to low air pressure
  2. Due to low temperature
  3. Due to ozone
  4. Due to high humidity

Force-pressure-mcqs
 

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Force-pressure-theory Physics-day-3 Target ssc cgl 2018

Force-pressure-theory Physics-day-3 Target ssc cgl 2018

FORCE AND PRESSURE

In science, a push or a pull on an object is called a force. Thus, we can say that the motion imparted to objects was due to the action of a force .Forces are due to an Interaction of one object with another object results in a force between the two objects. A force

  • May make an object move from rest.
  • May change the speed of an object if it is moving.
  • May change the direction of motion of an object.
  • May bring about a change in the shape of an object.
  • May cause some or all of these effects.

Newton’s Laws of Motion

I law

Every body continues to be at rest or in uniform motion unless an external force is applied to it.

This is also called law of inertia.

Inertia :  Inertia is the property of a body by the virtue of which the body opposes change in its initial state of rest or uniform motion on a straight line. It is of two types..

  • Inertia of rest
  • Inertia of motion

Newton’s I law defines force.

Force : Force is an external effect on the body which changes or tries to change the initial position of rest or uniform motion of the body.

II law

The rate of change of momentum of a body is directly proportional to the force applied on the body.

Force = mass * acceleration

Force-pressure-theory
III law

To every action, there is an equal and opposite reaction.

Some important definitions

Momentum : The product of mass and velocity is called momentum.

Momentum = mass * velocity

Impulse :  A large force acting on a body for a very small time is called impulse.

Centripetal force : When a body moves in a circular direction, a force acts on it continuously towards the centre of the path.  Therefore, some external force is required to maintain the circular motion of the body. This external force is called the centripetal force.

Centrifugal force : Centrifugal force is a pseudo force which is equal and opposite to centripetal force.

Friction

The force responsible for changing the state of motion of objects in all these examples is the force of friction. It is the force of friction between the surface of the ball and the ground that brings the moving ball to rest. The force of friction always acts on all the moving objects and its direction is always opposite to the direction of motion. Since the force of friction arises due to contact between surfaces, it is also an example of a contact force.

Non-contact Forces

A magnet can exert a force on another magnet without being in contact with it. The force exerted by a magnet is an example of a non-contact force Similarly, the force exerted by a magnet on a piece of iron is also a noncontact force.

Electrostatic Force 

A straw is said to have acquired electrostatic charge after it has been rubbed with a sheet of paper. Such a straw is an example of a charged body. The force exerted by a charged body on another charged or uncharged body is known as electrostatic force. This force comes into play even when the bodies are not in contact. The electrostatic force, therefore, is another example of a non-contact force.

Gravitational Force

Objects or things fall towards the earth because it pulls them. This force is called the force of gravity, or just gravity. This is an attractive force. The force of gravity acts on all objects. Gravity is not a property of the earth alone. In fact, every object in the universe, whether small or large, exerts a force on every other object. This force is known as the gravitational force.

Pressure

The force acting on a unit area of a surface is called pressure.

Pressure = force / area on which it acts.

At this stage we consider only those forces which act perpendicular to the surface on which the pressure is to be computed. So, the smaller the area, larger the pressure on a surface for the same force.

The device used to measure pressure is called barometer.

Pressure exerted by Liquids and Gases

Liquids exert pressure on the walls of the container. Gases, too, exert pressure on the walls of their container.

Pascal’s law for pressure (liquids)

If gravitational attraction is negligible, pressure is same at all points in a liquid.

If an external pressure is applied to an enclosed fluid, it is transmitted undiminished to every direction.

Atmospheric Pressure

You know that there is air all around us. This envelop of air is known as the atmosphere. The atmospheric air extends up to many kilometres above the surface of the earth. The pressure exerted by this air is known as atmospheric pressure.

The reason we are not crushed under this weight is that the pressure inside our bodies is also equal to the atmospheric pressure and cancels the pressure from outside.

WHAT YOU HAVE LEARNT

  • Force could be a push or a pull.
  • A force arises due to the interaction between two objects. Force has magnitude as well as direction. A change in the speed of an object or the direction of its motion or both implies a change in its state of motion.
  • Force acting on an object may cause a change in its state of motion or a change in its shape. A force can act on an object with or without being in contact with it.
  • Force per unit area is called pressure.
  • Liquids and gases exert pressure on the walls of their containers.
  • The pressure exerted by air around us is known as atmospheric pressure.

Force-pressure-theory
 

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Motion-Time-mcqs Physics-day-2 Target ssc cgl 2018

Motion-Time-mcqs Physics-day-2 Target ssc cgl 2018

Q1. Instrument used for measuring the speed is

(a)Barometer

(b)Speedometer

(c)Ammeter

(d)Odometer

Q2. A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle?

(a)Circle

(b)Parabolic

(c)Great circle

(d)Hyper-parabolic

Q3. For measuring small time intervals, we use.

(a)Sand clock

(b)Sundial

(c)Pendulum clock

(d)Water clock

Q4. The time period of a pendulum when taken to the Moon would:

(a)remain the same

(b)decrease

(c)become zero

(d)increase

Q5. On increasng the amplitude of vibrations of simple pendulum, its time period

(a)Increases

(b)Decreases

(c)Remains same

(d)First increases then decreases

Motion-Time-mcqs
Q6. Angular velocity can be obtained by the product of..

(a)Force and time

(b)Mass and velocity

(c)Angular speed and radius

(d)time and velocity

Q7. Which of the following is not a vector quantity?

(a)Distance

(b)Torque

(c)Velocity

(d)Displacement

Q8. The clocks and watches used for measuring time are based on.

(a)rectilinear motion

(b)circular motion

(c)periodic motion

(d)rotational motion

Q9. A sphere rolls down on two inclined planes of different angles but same height, it does so

(a)in the same time

(b)with the same speed

(c)in the same time with the same speed

(d)in the same time with the same kinetic energy

Q10. Which among the following is the smallest unit of mass?

(a)gram

(b)milligram

(c)nanogram

(d)kilogram

Motion-Time-mcqs
 

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Motion-Time-questions Physics-day-2 Target ssc cgl 2018

Motion-Time-questions Physics-day-2 Target ssc cgl 2018

Q1. If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

(a)constant speed

(b)constant velocity

(c)constant acceleration

(d)varying acceleration

Q2. For a body moving with non-uniform velocity and uniform acceleration

(a)Displacement -Time graph is linear

(b)Displacement-Time graph is non-linear

(c)Velocity -Time graph is nonlinear

(d)Velocity-Time graph is linear

Q3. Which of the following are used for accurately measuring very small time intervals?

(a)Pulsars

(b)Quartz clocks

(c)Atomic clocks

(d)White dwarfs

Q4. The time period of a seconds pendulum is

(a)1 second

(b)2 seconds

(c)0-5 second

(d)1-5 seconds

Motion-Time-questions
Q5. Instrument used for measuring the distance is

(a)Barometer

(b)Speedometer

(c)Ammeter

(d)Odometer

Q6. The slope of a velocity-time graph represents

(a)acceleration

(b)displacement

(c)distance

(d)speed

Q7. A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls

(a)behind him

(b)in front of him

(c)into his hand

(d)by his side

Q8. Which of the following is the S.I. unit of speed?

(a)m/s

(b)km/hr

(c)m/ns

(d)km/ns

Q9. Momentum is the product of…

(a)Force and time

(b)Mass and velocity

(c)Angular speed and radius

(d)time and velocity

Q10. What should a person on a freely rotating turn table do to decrease his (angular) speed?

(a)Bring his hands together

(b)Raise his hands up

(c)Spread his hands outwards

(d)Sit down with raised hands

 

Motion-Time-questions
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Motion-Time-theory Physics-day-2 Target ssc cgl 2018

Motion-Time-theory Physics-day-2 Target ssc cgl 2018

MOTION AND TIME

Types of Motion 

Uniform motion

The motion in which an object covers equal distance in equal intervals of time is called uniform motion.

Non-uniform motion

The motion in which an object covers an unequal distance in equal intervals of time is called non-uniform            motion.

Rectilinear motion

When an object moves along a straight line, it is called a rectilinear motion.

Circular motion

When an object moves along a circular path, it is called a circular motion.

Motion-Time-theory
Rotational motion

When an object turns about a fixed axis, it is called rotational motion.

Periodic motion

The motion which repeats itself after regular intervals of time, is called periodic motion.

Distance

Actual path covered by a body is called the distance travelled by it.

Displacement

Shortest distance between the final and the initial position of the body is called displacement.

Speed

It is the distance traveled by an object per unit time. S.I. unit of speed is m/s.

Speed = Distance/time

Velocity

Velocity is defined as the displacement of the object per unit time. S.I. unit of velocity is m/s.

Velocity = Displacement/time

Acceleration

Rate of change of velocity is known as acceleration. Its S.I. unit is m/s2.

Acceleration = Change in velocity/time

TIME

Time is a moment or duration in which things occur.

Measurement of time in Ancient times

  • Sundial….A sundial measures time by the position of the shadow cast by the Sun.
  • Sand clock (commonly known as hour-glass).
  • Water clock

Unit of time

The S.I. unit of time is second.

SIMPLE PENDULUM

  • A simple pendulum consists of a small metal ball suspended by a long thread from a rigid support, such that the bob is free to swing back and forth.
  • If the length of the string is kept constant, a pendulum completes every oscillation in exactly the same time.
  • To-and-fro motion of a pendulum is called oscillatory or periodic motion.

Measurement of Time

  • Earlier, pendulum clocks were used to measure time.
  • Nowadays, the regular oscillations of a tine quartz crystal are used for measuring time. 

Motion-Time-theory
What you have learnt

  • The distance moved by an object in a unit time is called its speed.
  • Speed of objects help us to decide which one is moving faster than the other.
  • The speed of an object is the distance travelled divided by the time taken to cover that distance. Its basic unit is metre per second (m/s).
  • Periodic events are used for the measurement of time. Periodic motion of a pendulum has been used to make clocks and watches.
  • Motion of objects can be presented in pictorial form by their distance-time graphs.
  • The distance-time graph for the motion of an object moving with a constant speed is a straight line.

 

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Heat-mcqs Physics-day-1 Target ssc cgl 2018 Tier 1

Heat-mcqs Physics-day-1 Target ssc cgl 2018 Tier 1

Q1. Heat stored in water vapour is

  1. specific heat
  2. latent heat
  3. absolute heat
  4. relative heat

Q2. A body absorbs heat most if it is

  1. black and rough
  2. black and smooth
  3. white and rough
  4. white and smooth

Q3. Water is used in hot water bags because

  1. It is easily obtained
  2. It is cheaper and is not harmful
  3. It has high specific heat
  4. It is easy to heat water

Q4. Which of the following criterion is used for any metal to be used as a cooking material?

  1. More specific heat
  2. More thermal conductivity
  3. Less thermal conductivity
  4. Less electrical conductivity

Heat-mcqs
Q5. When hot liquid is poured in to a thick glass tumbler, it cracks because glass :

  1. is a bad conductor of heat so only inner surface expands
  2. has high temperature coefficient of expansion
  3. has a very low specific heat
  4. has low temperature coefficient of expansion

Q6. When a ring of metal is heated what happens to its hole?

  1. expands
  2. contracts
  3. it expands or contracts according to its diameter
  4. it expands or contracts according to its coefficient of expansion

Q7. A gas thermometer is more sensitive than a liquid thermometer because a gas:

  1. is lighter than liquid
  2. expands more than a liquid
  3. is easy to obtain
  4. does not change state easily

Q8. Ocean currents are an example of

  1. convection
  2. conduction
  3. insulation
  4. radiation

Q9. White clothes are cooler than black ones because they

  1. absorb all the light that reaches them
  2. reflect all the light that reaches them
  3. will not allow the light to penetrate
  4. cool the sunlight completely

Q10. The speed of light with the rise in the temperature of the medium:

  1. Increases
  2. Decreases
  3. Remains unaltered
  4. Drops suddenly

Heat-mcqs
 

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