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Q:

What device converts light energy to electrical energy?

A) Photodiode B) Photovoltaic cell
C) Thermocouple D) Heliostats

Answer:   B) Photovoltaic cell



Explanation:

what_device_converts_light_energy_to_electrical_energy1555397376.png image

 

A device which is used to convert light energy directly into electrical energy is called as photovoltaic cell or a solar cell.

 

Heliostats convert light energy into heat energy.

 

A thermocouple is a device for measuring temperature.

Subject: Physics
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Q:

Acceleration is the rate of change of

A) Speed B) Velocity
C) Jerk D) Jounce
 
Answer & Explanation Answer: B) Velocity

Explanation:

The rate of change of velocity is called as Acceleration.

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Q:

Radiocarbon dating technique is used to estimate the age of

A) fossils B) rocks
C) monuments D) soil
 
Answer & Explanation Answer: A) fossils

Explanation:

Radiocarbon dating also referred to as carbon dating or carbon-14 dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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Q:

Carbon Arc lamps are commonly used in

A) cinema projectors B) photography
C) vehicles D) domestic lighting
 
Answer & Explanation Answer: A) cinema projectors

Explanation:

The carbon arc lamp was the first widely-used type of electric light and the first commercially successful form of electric lamp.

carbon_arc_lamps_are_commonly_used_in1562825984.jpg image

Here are the Carbon Arc Lamp Uses :


-Super bright light, capable of lighting a large length of street or a large factory interior.

-Was the ONLY electric light available to light large areas from 1800 - 1901.

-Was cheaper to light streets with the arc lamp than gas or oil lamps.

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Q:

Glass is made of which material?

A) Calcium carbonate B) Sand
C) Silver Iodide D) Lime
 
Answer & Explanation Answer: B) Sand

Explanation:

Glass is made from heating of sand. To melt sand to make glass, the temperature needed is above 1800 deg celcius.

glass_is_made_of_which_material1562221721.jpg image

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Q:

Bandwidth is the

A) a measure of the width of a range of frequencies B) the rate of data transfer
C) both a & b D) None of the above
 
Answer & Explanation Answer: C) both a & b

Explanation:
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Q:

Kilohertz is a unit which measures

A) Electromagnetic radio wave frequencies B) Electric resistance
C) Power used by a current of one ampere D) Voltage
 
Answer & Explanation Answer: A) Electromagnetic radio wave frequencies

Explanation:

The hertz (Hz) is defined as one cycle per second and is a SI unit of frequency. Here kilohertz is also a unit of frequency of waves and is defined as 1000 cycles per second. Radio waves are measured in kilohertz (KHz).

 

Kilohertz_is_a_unit_which_measures1561453991.jpg image

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Q:

Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as

A) Cornering B) BLowout
C) Power D) Braking
 
Answer & Explanation Answer: D) Braking

Explanation:

A skid happens whenever the tires lose their grip on the road. Braking skids occur when the brakes are applied so hard that the front or rear wheels lose traction.

Skids_occur_when_the_brakes_are_applied1561010817.jpg image

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Q:

A doppler effect occurs when a source of sound moves

A) away from you B) towards you
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The Doppler effect or Doppler shift is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. 

a_doppler_effect_occurs_when_a_source_of_sound_moves1560770484.jpg image

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