PHY101 Quiz 1 2021 Solved - Physics Solved Quiz

 

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PHY101 Quiz 1 

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1) If the magnitude of force applied is increased, the word done will ___.

Select the correct option

a) have no change

b) become zero

c) be increased

d) be decreased 

2) An object moves in a circle at constant speed. The work done by the centripetal force is zero because:

Select the correct option

a) the displacement for each revolution is zero

b) the average force for each revolution is zero

c) there is no friction

d) the centripetal force is perpendicular to the velocity 

3) When the velocity of an aeroplane is doubled, the momentum ___.

Select the correct option

a) Increase uniformly

b) Becomes zero

c) Is conserved

d) Remains unchanged

4) The momentum of an object at a given instant is independent of its:

Select the correct option

a) acceleration

b) velocity

c) speed

d) mass

5) What sort of energy does flying bird possess?

Select the correct option

a) Potential energy

b) Kinetic energy

c) Elastic energy

d) Both potential and kinetic energy

6) The acceleration of projectile in x-direction:

Select the correct option

a) depends on initial velocity

b) depends on how long it is in the air

c) depends on y-acceleration

d) 0 m/s^2

7) Light year is a unit of:

Select the correct option

a) acceleration

b) velocity

c) time

d) distance

8) The goal of all scientific inquiry (or scientific method) is:

Select the correct option

a) world peace

b) predicting natural events based

c) to make everyone rich and happy

d) world dominion

9) The angle between rectangular components of a vector is:

Select the correct option

a) 00

b) 450

c) 600

d) 900

10) A ___ vector is obtained by dividing the vector by its magnitude

Select the correct option

a) unit

b) position

c) normal

d) negative

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11) According to the equation of work, when a boy sits in one place and studies for the whole night, he does

Select the correct option

a) lot of work

b) no work

c) too much work

d) very little work

12) the projectile path is known as its:

Select the correct option

a) range

b) trajectory

c) curve

d) time of action

13) If force of friction is negligible, then acceleration of two freely falling objects of different masses is:

Select the correct option

a) None of these

b) Smaller acceleration for smaller mass

c) Variable

d) The same

14) Add two vectors of length 4 m & 5m but their orientation is not known. The length after addition of these two vectors will be:

Select the correct option

a) between 9 m and 1 m

b) 9 m 

c) between 9 m and 5

d) Less than 1 m

15) The dimensional units of ratio of work and power is:

Select the correct option

a) L

b) F

c) J

d) T

16) A sphere of moment on inertia I rolls down an inclined plane without slipping. The ratio of the rotational kinetic energy to the transitional kinetic energy is nearly:

Select the correct option

a) 5/7

b) 7/5

c) 2/5

d) 5/2

17) Swimming becomes possible because of:

Select the correct option

a) First law of motion

b) Second law of motion

c) Third law of motion 

d) Law of torque

18) A/an ___ is the basic reason to change in the motion of an object according to Newton’s second law of motion

Select the correct option

a) acceleration

b) change in velocity

c) net force

d) decrease in inertia

19) If the distance between all pairs of particles of the body do not change by applying a force, then a body is said to be

Select the correct option

a) rigid

b) small

c) large

d) flexible

20) The center of mass of Earth’s atmosphere is:

Select the correct option

a) near the outer boundary of the atmosphere

b) near the center of earth

c) a little less than halfways between earth’s surface and the outer boundary of the atmosphere

d) near the surface of earth

21) An object attached to one end of a spring males 20 complete oscillations in 10 s. Its period is:

Select the correct option

a) 0.5 s

b) 0.5Hz

c) 2 s

d) 2Hz

22) Whenever an object strikes a stationary object of equal mass:

Select the correct option

a) the first object must stop

b) the two objects cannot stick together

c) none of these

d) the collision must be elastic

23) If a wheel turns with constant angular speed then:

Select the correct option

a) each point on its moves with constant velocity

b) each point on its rim moves with constant acceleration

c) the wheel turns through equal angles in equal times

d) the angle through which the wheel turns in each second increases as time goes on

24) A stone is thrown up from the surface of earth, the it reaches

a maximum height, kinetic energy is equal to:

Select the correct option

a) ½ mv

b) mgh

c) 2mgh

d) zero

25) In Simple harmonic motion, the magnitude of the acceleration is

Select the correct option

a) greatest when the velocity is greatest

b) proportional to the displacement

c) inversely proportional to the displacement

d) constant

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