272
Q:

The working principle of a washing machine is

A) reverse osmosis B) diffusion
C) centrifugation D) dialysis

Answer:   C) centrifugation



Explanation:

The working principle of a washing machine is centrifugation.

The_working_principle_of_a_washing_machine_is1542349278.jpg image

Subject: Physics
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Q:

Electrical Energy is the energy of

A) Protons B) Neutrons
C) Electrons D) All the above
 
Answer & Explanation Answer: C) Electrons

Explanation:

We know that Kinetic energy is the energy of a moving object and in the same way Electrical energy is the form of kinetic energy caused by moving electric charges called electrons.

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Q:

The energy associated with motion is called

A) Potential energy B) Kinetic energy
C) Both A & B D) Stored energy
 
Answer & Explanation Answer: B) Kinetic energy

Explanation:

Energy can be either potential or kinetic. The energy associated with motion is called Kinetic energy and similarly, the energy associated with position is called Potential energy.

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1 29
Q:

Electric current is measured by which instrument?

A) voltmeter B) ammeter
C) barometer D) sinometer
 
Answer & Explanation Answer: B) ammeter

Explanation:

Electric current is measured by the instrument called ammeter. As current in a circuit is measured in amperes, the instrument used is called as ammeter.

Electric_current_is_measured_by_which_instrument1555505098.jpg image

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1 38
Q:

Speed in a given direction is called

A) Velocity B) Torque
C) Acceleration D) Displacement
 
Answer & Explanation Answer: A) Velocity

Explanation:

Speed in a given direction is called Velocity.

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0 35
Q:

One light year is approximately equal to

A) 10^12 mts B) 10^16 mts
C) 10^11 mts D) 10^13 mts
 
Answer & Explanation Answer: B) 10^16 mts

Explanation:

Light year is the unit of to express astronomical distances, that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.

 

Approximately, 1 light year = 10^16 mts.

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1 8
Q:

What device converts light energy to electrical energy?

A) Photodiode B) Photovoltaic cell
C) Thermocouple D) Heliostats
 
Answer & Explanation 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.

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1 50
Q:

The unit of energy in MKS system is

A) Joule B) Ohm
C) Erg D) Volt
 
Answer & Explanation Answer: A) Joule

Explanation:

The unit of energy in MKS system is Joule.

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3 90
Q:

Gear Lapping is an operation

A) for gear reconditioning B) prior to heat treatment
C) after heat treatment D) None of the above
 
Answer & Explanation Answer: C) after heat treatment

Explanation:

Gear Lapping is an operation after heat treatment. Gear lapping is the process of imparting a very fine finish and high degree of accuracy to gear teeth, by using a lapping tool and applying a fine-grained abrasive between a work material and a closely fitting surface, called a lapping plate.

Gear_Lapping_is_an_operation1554186430.jpg image

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