Science (Practice Test-1)

1. Which of the following physical quantities has no unit.

  • Density
  • Mass
  • Volume
  • Relative density
Answer
Relative density

2. Which of the following physical quantity which has same unit in all the system.

  • Mass
  • Area
  • Length
  • Time

Answer
Time

3. Velocity of sound will be minimum in-

  • In liquid
  • In mercury
  • Solid
  • In gas

Answer
In gas

4. If the focal length of a concave lens is 20 cm its power is-

  • 2 D
  • -2 D
  • 5 D
  • -5 D

Answer
-2 D

5. Which of the following is a vector quantity.

  • Temperature
  • Work
  • Pressure
  • Momentum

Answer
Momentum

6. Which colour has minimum refractive index-

  • Red
  • Violet
  • Yellow
  • Green

Answer
Red

7. Frequency of intrasonic wave is-

  • Between 20 Hz and 20,000 Hz
  • More than 20 Hz
  • More than 20,000 Hz
  • Less then 20 Hz.

Answer
Less then 20 Hz.

8. Pascal is a unit of –

  • pressure
  • force
  • movement
  • energy

Answer
pressure

9. Photo chemical reaction are caused by –

  • Electrical energy
  • Absorption of light
  • Dissipation if light
  • None of these

Answer
Absorption of light

10. Angstrom is the unit used for measuring very small lenths such a wave lengths of light is equal to-

  • 10⁻⁶ cm
  • 10⁻⁸ cm
  • 10⁻¹² cm
  • 10⁻¹⁵ cm

Answer
10⁻⁸ cm