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Mixed Test (Physics)

Covers fundamental physics topics including mechanics, waves, electricity, and dimensional analysis at a basic level

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Length cannot be measured by

  1. fermi
  2. micron
  3. kilometer
  4. de-bye
  5. centimeter
Question 2 Multiple Choice (Single Answer)

Phase difference between the waves y = a sin (ωt + kx) and y = a cos (ωt + kx) is

  1. π/4
  2. π/2
  3. π/6
  4. π
  5. π/13
Question 3 Multiple Choice (Single Answer)

Mechanical waves transfer________.

  1. energy
  2. matter
  3. both (1) and (2)
  4. either (1) or (2)
  5. none of these
Question 4 Multiple Choice (Single Answer)

The distance between a node and an adjacent antinode in a stationary wave is

  1. λ/2
  2. λ/6
  3. λ/4
  4. λ
  5. λ/12
Question 5 Multiple Choice (Single Answer)

If the dimensions of a physical quantity are given by [MxLyTz], then the physical quantity shall be

  1. Work if x = 1, y = 2, z = - 2
  2. Pressure if x = 1, y = - 1, z = 2
  3. Velocity if x = 0, y = 0, z = - 1
  4. Acceleration if x = 1, y = 1, z = - 2
  5. Acceleration if x = 1, y = 1, z = 0
Question 6 Multiple Choice (Single Answer)

The current gain (β) of a transistor in common emitter mode is 10. If the change in collector current is by 50mA at constant VCE, the necessary change in the base current is

  1. 0.5mA
  2. 5mA
  3. 50mA
  4. 5A
  5. 8A
Question 7 Multiple Choice (Single Answer)

Bullets of mass 0.02 kg each, hit a plate at the rate of 300 bullets per second with a velocity of 50 ms-1 and reflect back with a velocity of 20 ms-1. The average force (in newton) acting on the plate is

  1. 420
  2. 480
  3. 180
  4. 222
  5. 360
Question 8 Multiple Choice (Single Answer)

The momentum of a body is increased by 25%. The kinetic energy is increased by about ______.

  1. 34%
  2. 56%
  3. 65%
  4. 5%
  5. 23%
Question 9 Multiple Choice (Single Answer)

A semi-circular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at its centre is

  1. λ/2πє0r2
  2. λ/4πє0r2
  3. λ/3πє0r
  4. λ/2π є0r
  5. λ/21π є0r
Question 10 Multiple Choice (Single Answer)

Two electric lines of force intersect each other.

  1. True
  2. False
  3. May be true
  4. May be false
  5. None of these
Question 11 Multiple Choice (Single Answer)

A man climbs up and a monkey climbs down a rope hanging from a tree with same uniform acceleration separately. If the respective masses of monkey and man are in the ratio 3 : 2, the common acceleration must be

  1. 7/g
  2. 5g
  3. g/9
  4. g/5
  5. g/11
Question 12 Multiple Choice (Single Answer)

A string over a smooth massless pulley connects two blocks of masses m1 & m2 (vertically). If the acceleration of the system is (g/10), then the ratio of masses is

  1. 8 : 1
  2. 9 : 7
  3. 11 : 9
  4. 3 : 5
  5. 5 : 3
Question 13 Multiple Choice (Single Answer)

In a rocket of mass 3000kg, fuel is consumed at a rate of 40 kg s-1. The velocity of gases ejected from rocket is 4 x 104 ms-1. The thrust on the rocket is_____.

  1. 2 x 106N
  2. 16 x 106N
  3. 1.6 x 106N
  4. 1.0 x 106N
  5. 5.6 x 106N
Question 14 Multiple Choice (Single Answer)

The power of a water pump is 1 kW. If g = 10 ms-2, the amount of water it can raise in one minute to a height of 15 m is

  1. 400 litre
  2. 2000 litre
  3. 1500 litre
  4. 300 litre
  5. 100 litre
Question 15 Multiple Choice (Single Answer)

When a simple pendulum is made to oscillate on the surface of moon, the time period_______.

  1. decreases
  2. increases
  3. remains constant
  4. either increases or decreases
  5. none of these
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