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Question Detail
Light year is a unit of
- Time
- Light
- Distance
- Intensity of light
Answer: Option C
1. What is refractive index ?
- it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
- it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .
- it is defined as the product of speed of light in medium and in vacuum.
- None of above
Answer: Option B
2. The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called
- Nuclear fusion
- Nuclear fission
- Nuclear reaction
- Fast breeding
Answer: Option B
3. The force which opposes the relative motion between different layers of liquid or gases is called
- Critical Velocity
- Streamline Flow
- Terminal Velocity
- Viscous Force
Answer: Option D
Explanation:
Critical Velocity - The maximum velocity upto which fluid motion is streamline is called Critical Velocity.
Streamline Flow - If velocity of all fluid particles is same all the time then it can be said in streamline flow.
Terminal Velocity - When a body falls in viscous medium, its velocity first increases and finally becomes constant. The constant velocity is called terminal velocity.
4. All planets move around the sun in elliptical orbits, with the sun being at rest at one focus of the orbit.
- True
- False
Answer: Option A
5. Name of the instrument to measure atomspheric pressure ?
- Barometer
- Barograph
- Bolometer
- Callipers
Answer: Option A
Explanation:
Barograph - Recordings of atmospheric pressure,
Bolometer - Used to measure heat radiation,
Callipers - Used to measure inner and outer diameters of bodies.
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