# PHY101 Solved MCQs Mega File

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As the wavelength of a wave in a uniform medium increases, its frequency will _____.

Decrease

9

A bullet shot straight up returns to its starting point in 10 sec. the initial speed was:

49 m/s

11

Young’s modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface of an object to:

the fractional change in length

12

A ball is thrown upward into the air with a speed that is greater than terminal speed. It lands at the place where it was thrown. During its flight the force of air resistance is the greatest:

at the top of its trajectory

13

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

5/7

14

 The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called

Reverberation

15

A municipal water supply is provided by a tall water tower. Water from this tower flows to a building. How does the water flow out of a faucet on the ground floor of a building compare with the water flow out of an identical faucet on the second floor of the building?

Water flows more rapidly out of the ground-floor faucet.

16

An elastic collision is one in which:

kinetic energy and momentum are both conserved

17

The ultimate strength of a sample is the stress at which the sample

Breaks/ returns to its original shape when the stress is removed

18

The dot product of vector A with itself is equal to:

A^2

19

A heavy particle moving with 5 m/s suffers an elastic collision with a light particle at rest. After the collision, the velocity of light particle will be:

5 m/s

20

Young’s modulus can be correctly given in:

N/m2

21

A net torque applied to a rigid object always tends to produce:

angular acceleration

23

The velocity-time graph is parallel to the time axis the acceleration of moving body is:

zero

24

What is the angle of projection of projectile, for which its maximum height and horizontal range are equal?

76

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A particle

26

The  dimensional units of the ratio of work and power is:

T

27

The magnitude of the acceleration on the planet in orbit around the Sun is proportional to.

the mass of the Sun

28

A Prosonic wave I gent from @ ship towards the bottom of the sea. N is found that the time interval between the sending and receiving of the wave is 1.6 5. What is the depth of the sea. if the velocity of sound in the seawater is

1120m

29

Water flows into © house at e velocity of 15 m/s through a pipe that has 9 radii of 0.40 m. The water then flows through a smaller pipe at a velocity of 45 m/s. What is the radius of the smuttier pipe?

0.23m

30

A mosquito’s buzz is often rated with a decibel rating of 40 dB. Normal conversation is often rated at 60 dB. How many times more intense is normal conversation compared to 6 mosquito's buzz?

20

31

People try to keep the... over their feet. in order to feel stable.

center of gravity

32

If force is applied at the center of mass then torque is.

Zero

33

As the wavelength of a wave in a uniform medium increases. its speed will

Decrease

34

For an ideal fluid flowing through a horizontal pipe, Bernoulli's equation state that the sum of the pressure and energy per unit volume along the pipe does which of the following?

Remains constant as the pipe diameter increases

35

Which of the following statement is true?

Weight is a force, mass is a measure of inertia

36

A/an ----------  is the basic reason to change in the motion of an object according to Newton’s second law of motion.

Net force

37

When spring is compressed  or stretched, the potential energy of spring

Increase

38

The ultimate strength of a sample is the stress in which the sample:

Breaks

39

The value of k in coulomb’s law depends upon:

Medium between two charges

40

The law of inertia was firstly formulated by

Newton

41

The ratio of the circumference of a circle to its diameter is equal to:

Pi

42

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. assuming the entire lower surface of the bed in contact with the floor, what is the pressure the bed exerts on the floor?

280 pa

43

The center of gravity is the average location of the …….. of an object

Weight

44

Acceleration in a body is always produced in the direction of

Force

45

As per coulomb’s law, the force of attraction or repulsion between two-point charge directly proportional to the

Product os the magnitude of charges

46

One revolution is the same as:

47

A -------------- vector is obtained by dividing the vector by its magnitude:

Unit

48

Take the speed of the sound to be 340m/s. A thunderclap is heard about 3 s after the lightning is seen. The source of both light and sound is:

49

The fundamental dimensions of angular momentum are :

ML2T-1

50

The approximate value of get an altitude above Earth equal to one Earth diameter is:

4.9m/s2

51

If the speed of sound is 340m/s a plane flying at 400rm/s creates @ conical shock wave with an

apex half-angle of:

Zero

52

If the distance between all pairs of particulars of the body do not change by applying a force that a body is said to be

Rigid