Practice MCQ Questions and answers on Physics-GK

1

The motion of a freely falling body is an example of ________ accelerated motion.

A) Non-uniformly B) Uniformly C) Uniquely D) Specially

Discuss

Answer & Solution

Answer: Option B

Solution:

The motion of a freely falling body is an example of uniformly accelerated motion.

2

A body is initially moving with a velocity of 5 m/s. It undergoes an acceleration of 2 m/s² for 4 seconds. Find the displacement (in m) of this body in these 4 seconds.

A) 4 B) 72 C) 36 D) 8

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

3

Formula for distance is

A) Speed x time B) Time / speed C) Speed x acceleration D) Velocity / speed

Discuss

Answer & Solution

Answer: Option A

Solution:

Formula for distance is speed x time.

4

Which among the following is false about displacement?

A) It can be positive, negative or zero B) Displacement is never greater than Distance C) Its SI unit is meter D) It is always positive

Discuss

Answer & Solution

Answer: Option D

Solution:

Displacement can be either positive or negative.

5

The motion of the wheels of a bullock-cart while moving on the road is an example of

A) Oscillatory and rotatory motion B) Oscillatory and translatory motion C) Translatory and rotatory motion D) Translatory motion only

Discuss

Answer & Solution

Answer: Option C

Solution:

Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translatory motion into rotatory motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.

6

As we go from Equator to North pole the value of ''g', the acceleration due to gravity

A) Remains the same B) Decreases C) Increases D) None of the above

Discuss

Answer & Solution

Answer: Option C

Solution:

As, the earth is not a perfect sphere, the gravity keeps on changing as we move from one place to another. But it is maximum at the place where it is nearer to the centre. So,Earth's gravity is the maximum at the poles because the Earth is kind of an ellipse (not a perfect sphere). And the equator is further away from the centre of mass of the Earth than at the poles.
So, as we go from equator to poles, the value of g increases.

7

Speed in a given direction is called

A) Velocity B) Torque C) Acceleration D) Displacement

Discuss

Answer & Solution

Answer: Option A

Solution:

The speed of an object in a particular direction is called velocity.

8

For a body moving with uniform acceleration its final velocity equals ________

A) Average velocity - initial velocity B) 2 x average velocity - initial velocity C) 2 x average velocity + initial velocity D) Average velocity + initial velocity

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

9

A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/s²) is:

A) 3 B) 5 C) 6 D) 7

Discuss

Answer & Solution

Answer: Option A

Solution:

Initial speed = u = 18 km/hr = 5 m/s
Final speed = v = 72 km/hr = 20 m/s
acceleration a = (v-u)/t = (20 - 5)/5 = 3 m/s².

10

In ________ motion of a body its velocity varies with time.

A) Uniform B) Linear C) Equilibrium D) Non-uniform

Discuss

Answer & Solution

Answer: Option D

Solution:

In non-uniform motion of a body its velocity varies with time.