2
Q:

# Which determines the frequency of a sound wave?

 A) Amplitude B) Speed C) Source D) Medium

Explanation:

The frequency of a sound wave is determined by the amplitude of the wave. As amplitude of the wave is high the frequency of the wave will also be high.

Subject: Physics
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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 19
Q:

Electric current is measured by which instrument?

 A) voltmeter B) ammeter C) barometer D) sinometer

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.

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1 35
Q:

Speed in a given direction is called

 A) Velocity B) Torque C) Acceleration D) Displacement

Explanation:

Speed in a given direction is called Velocity.

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0 10
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 6
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:

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 37
Q:

The unit of energy in MKS system is

 A) Joule B) Ohm C) Erg D) Volt

Explanation:

The unit of energy in MKS system is Joule.

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3 88
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.

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0 99
Q:

Thermoplastic materials are those materials which

 A) Do not become hard with the application of heat and pressure and no chemical change occurs B) Are flexible and can withstand considerable wear under suitable conditions C) Are formed into shape under heat and pressure and results in a permanently hard product D) Are used as a friction lining for clutches and brakes

Answer & Explanation Answer: A) Do not become hard with the application of heat and pressure and no chemical change occurs

Explanation:

Thermoplastic materials is a type of plastic material that can be cooled and heated several times without any change in their chemistry or mechanical properties.

Examples of Thermoplastic ::

• polyethylene,
• polypropylene,
• polyvinyl chloride,
• polystyrene,
• polybenzimidazole,
• acrylic,
• nylon and
• teflon