Physics Questions

Q:

Heat is associated with

A) K.E of random motion of molecules B) K.E of orderly motion of molecules
C) Total K.E of random and orderly motion of molecules D) None of these
 
Answer & Explanation Answer: A) K.E of random motion of molecules

Explanation:
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Q:

Compressions and Rarefactions are characteristic of

A) Longitudinal waves B) Transverse waves
C) Both A & B D) Neither of A & B
 
Answer & Explanation Answer: A) Longitudinal waves

Explanation:

Compressions and Rarefactions are characteristic of Longitudinal waves.

The direction of vibration of the particles is in the same plane as in which the wave is propagating. The particles vibrate back and forth, about their mean positions.

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Q:

Why does the sea appear blue in colour?

A) Reflection of the sun light from water surface B) Interference of the sun light from water surface
C) Scattering of the sunlight by water molecules D) refraction of the sun light
 
Answer & Explanation Answer: C) Scattering of the sunlight by water molecules

Explanation:

Sea appears blue in colour due to the scattering of the rays when they hit water molecules

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Q:

RADAR is used for

A) detecting and locating the position of objects such as Aeroplanes B) locating submerged submarines
C) locating geostationary satellites D) receiving a signals in a radio receiver
 
Answer & Explanation Answer: A) detecting and locating the position of objects such as Aeroplanes

Explanation:

RADAR - RAdio Detection And Ranging.

A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. 

 

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

 

Radio waves from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed.

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Q:

Heat energy of an object is

A) the average energy of the molecules of the object B) the total energy of the molecules of the object
C) the average velocity of the molecules of the object D) the average potential energy of the molecules of the object
 
Answer & Explanation Answer: B) the total energy of the molecules of the object

Explanation:
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Q:

Lens is made up of which glass

A) Ordinary glass B) Pyrex glass
C) Flint glass D) Cobalt glass
 
Answer & Explanation Answer: C) Flint glass

Explanation:
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Q:

Which process allows water to enter the atmosphere?

A) Transpiration B) Respiration
C) Condensation D) Evaporation
 
Answer & Explanation Answer: D) Evaporation

Explanation:

Evaporation is the process that allows water to enter into the atmosphere.

Sunlight turns liquid water into water vapor which then rises higher into the atmosphere and forms into clouds.

 

Plants, too, help water get into the atmosphere through a process called transpiration.

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Q:

Radian is used to measure

A) Temperature B) Intensity of Flame
C) Angle D) Solid Angle
 
Answer & Explanation Answer: C) Angle

Explanation:

Kelvin is used to measure Temperature,

Candela is used to measure Intensity of flame,

Steredian is used to measure Solid Angle.

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