# Important Physics MCQ for SSC CGL 2018 : SSC CHSL 2017

Important Physics MCQ for SSC CGL 2018 : SSC CHSL 2017

Q 1. The slope of the velocity time graph for retarded motion is

(a) positive

(b) negative

(c) zero

(d) can be positive, negative or zero

Q2. Which of the following can be zero, when a particle is in motion for some time?

(a) distance

(b) displacement

(c) speed

(d) none of them

Q3. Which of the following decreases in motion along a straight line with constant retardation while the body is moving away from the origin

(a) Speed

(b) Acceleration

(c) Displacement

(d) none of the above

Q4. If distance covered by a particle is zero , what can you say about its displacement?

(a) it may or may not be zero

(b) it cannot be zero

(c) it is negative

(d) it must be zero

Q5. If displacement of a partical is zero, distance covered by it

(a) may be zero or may not be zero

(b) it must be zero

(c) it must not be zero

(d) all are true

Q6. The numerical ratio of displacement to distance is

(a) always less than one

(b) always equal to one

(c) always more than one

(d) equal to or less than one

Q7. The numerical ratio of average velocity to average speed is

(a) always less than one

(b) always equal to one

(c) always more than one

(d) equal to or less than one

Q8. A body moving with uniform velocity is in equilibrium.

(a) true

(b) false

(c) may be true or false

(d) can’t say

Q9. The location of a particle has changed. What can we say about the displacement and the distance covered by the particle.

(a) neither can be zero

(b) one may be zero

(c) both may be zero

(d) one is positive, other is negative

Q10. Which of the following is not an example of linear motion.

(a) an aeroplane  moving on a straight track with increasing speed

(b) a body in uniform circular motion

(c) wheel rotating at uniform speed on road

(d) a body rolling down an inclined plane

Q11. A body cannot have a

(a) zero speed and non zero acceleration

(b) non zero speed and zero acceleration

(c) constant velocity and a varying speed

(d) constant speed and a varying velocity

Q12. A passenger in a moving train tosses a coin. If the coin falls behind him, the train must be moving with

(a) an acceleration

(b) a deceleration

(c) a uniform speed

(d) any of the above

Q13. A body is imparted motion from rest to move in a straight line. If it is then obstructed, by an opposite force, then

(a) the body may necessarily change direction

(b) the body is sure to slow down

(c) the body will necessarily continue to move in the same direction at the same speed

(d) none of the above

Q14. At the top of the trajectory of a projectile, the acceleration is

(a) the maximum

(b) the minimum

(c) zero

(d) g

Q15. The slope of velocity time graph for motion with uniform velocity is equal to

(a) final velocity

(b) initial velocity

(c) zero

(d) none of the above

##### Explanations:

Ans. 1 (b) The slope of velocity time graph denotes acceleration. For a retarded motion acceleration is negative.

Ans. 2 (b) Displacement may be zero because final position of the particle may coincide with its initial position.

Ans. 3 (a) When a body moves along a straight line with constant retardation, its speed goes on decreasing.

Ans. 4 (d) Distance covered by a particle is zero only when it is at rest. Therefore, its displacement must be zero.

Ans. 5 (a) When displacement is zero, particle may be at rest, therefore, distance travelled=0.

Again, when displacement is zero, final position coincide with the initial position, distance travelled is not zero.

Ans. 6 (d) As displacement less than equal to distance, therefore, the ratio is equal to or less than one.

Ans. 7 (d) From the previous question, it follows that average velocity is equal to or less than one.

Ans. 8 (a) No net force act on a particle moving with uniform velocity. Therefore, it is in equilibrium

Ans. 9 (a) When location of a particle has changed, it must have covered some distance and undergone some displacement.

Ans. 10 (b) A body in uniform circular motion is moving in a plane and is two dimensional motion.

Ans. 11 (c) Constant velocity means a constant speed in a particular direction.

Ans. 12 (a) As the coin falls behind him, force due to air must be backward. Therefore the train must be acceleration forward.

Ans. 13 (b) The apposing force must cause retardation, due to which the body is sure to slow down.

Ans. 14 (d) The acceleration due to gravity is acting throughout the motion of projectile.

Ans. 15 (c) The velocity time graph for uniform motion is a straight line parallel to time axis. Its slope is zero.

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