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Question Detail
Which instrument is used in submarine to see the objects above sea level ?
- Pykometer
- Polygraph
- Photometer
- Periscope
Answer: Option D
Explanation:
Pykometer - used to determine the density and coefficient of expansion of liquids,
Polygraph - used to record changes in heartbeat, blood-pressure and respiration,
Photometer - used to compare luminous intensity of the source of light.
1. Force of attraction between the molecules of different substances is called
- Surface tension
- Cohensive force
- Adhesive force
- None of above
Answer: Option C
Explanation:
Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.
2. 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.
3. 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
4. Harry Brearley has invented
- Electric iron
- Electromagent
- Stainless Steel
- Gramophone
Answer: Option C
Explanation:
Harry Brearley of England has invented Stainless Steel in 1913,
Electric iron has been invented by H.W. Seeley of USA in 1882,
Electromagent has been invented by W.Sturgeon of England in 1824,
Gramophone has been invented by T.A. Edison of USA in 1878.
5. Which instrument is used to record physical happenings at a distant place ?
- Thermostat
- Tonometer
- Telemeter
- Transponder
Answer: Option C
Explanation:
Thermostat - is used to regulate the temperature at a particular point.
Tonometer - is used to measure the pitch of a sound,
Transponder - is used to receive a signal and transmit a reply immediately.
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