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1009 available questions

Physics · Question 421

The net displacement divided by the total time (t) is known as:

  1. Instantaneous velocity
  2. Uniform velocity
  3. Average velocity
  4. Variable velocity
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Correct answer: C

Average velocity

Physics · Question 422

Work is done by the applying force when:

  1. applied force is variable
  2. applied force is prependicular to the motion
  3. applied force generated motion
  4. applied force is constant
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Correct answer: C

applied force generated motion

Physics · Question 423

A body of mass 10kg moving at a hiehg of 2 m, with uniform speed of 2 m/s. Its total energy is

  1. 316 J
  2. 216 J
  3. 392 J
  4. 416 J
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Correct answer: B

216 J

Physics · Question 424

Which radiation is ued in smoke detectors?

  1. alpha
  2. beta
  3. gamma
  4. all of these
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Correct answer: A

alpha

Physics · Question 425

An electic fan rotating at 3 rev s-1 is switched off. It comes to rest in 19.0 s. Assuming deceleration to be uniform. How many revolutions did it turn before soming to rest?

  1. 30 rev
  2. 27 rev
  3. 40 rev
  4. 10 rev
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Correct answer: B

27 rev

Physics · Question 426

In pair annihilation two gamma ray photons created, travel in opposite direction not in the same direction, because:

  1. This proves law of conservation of energy
  2. This proves law of conservation of momentum
  3. This proves law of conservation of charge
  4. This proves law of conservation of mass-energy
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Correct answer: B

This proves law of conservation of momentum

Physics · Question 427

The velocity time graph of a motion starting from rest with uniform acceleration is a Straight line:

  1. Not passing through origin
  2. Parallel to time axis
  3. Parallel to velocity axis
  4. Passing through origin
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Correct answer: D

Passing through origin

Physics · Question 428

In a Young's double-slit experiment, fringes are very close to each other. How can we increase the distance between fringes?

  1. by inceasing the distance between light source and slits
  2. by increasing the distance from slits to the screen
  3. by increasing the distance between slits
  4. by increasing the frequence of light
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Correct answer: B

by increasing the distance from slits to the screen

Physics · Question 429

Two bodies A and B of temperatures Ta= 100°C and Tp =0°C are brought in thermal contact with each other. Which one in the followings is possible at thermal equilibrium?

  1. Ta =0°C, Ta = 100°C
  2. Ta = GC, Ts= 50°C
  3. Ta = 45°C, Ta = 45°C
  4. Ta = 60°C, Te = 40r
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Correct answer: C

Ta = 45°C, Ta = 45°C

Physics · Question 430

An ideal gas of N molecules are enclosed in a container at a constant pressure p. The graph between volume of gas and its absolute temperature is a straight line. What is the gradient of the graph?

  1. NR ------------- p
  2. N R P
  3. N k ------------ p
  4. N k p
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Correct answer: B

N R P