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Q:

# A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

 A) a parabola B) a circle C) a horizontal straight line D) a vertical straight line

Answer:   A) a parabola

Explanation:

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

Subject: Physics
Q:

Low voltage cables are meant for use up to

 A) 3.3 kV B) 1.1kV C) 11 kV D) 0.5 kV

Answer & Explanation Answer: B) 1.1kV

Explanation:

Low Voltage Cables are used to supply power for use up to 1.1 kV.

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0 187
Q:

A manometer is used to measure

 A) earthquake B) pressure C) temperature D) density

Answer & Explanation Answer: B) pressure

Explanation:

A manometer is used to measure a pressure difference between two points.

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0 168
Q:

Mirage is due to

 A) Magnetic disturbances in the atmosphere B) Equal heating of different parts of the atmosphere C) Unequal heating of different parts of the atmosphere D) Depletion of ozone layer in the atmosphere

Answer & Explanation Answer: C) Unequal heating of different parts of the atmosphere

Explanation:

Mirage is a naturally occurring optical phenomenon due to unequal heating of different parts of the atmosphere in which light rays bend to produce a displaced image of distant objects or the sky.

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0 104
Q:

Speed regulation of synchronous motor is

 A) 1% B) 25% C) Zero D) 0.5%

Answer & Explanation Answer: C) Zero

Explanation:

Synchronous motor is a motor which runs at a constant speed irrespective of load attached to it. So the speed regulation of synchronous motor is ZERO.

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1 88
Q:

Cryogenic Engines find applications in

 A) Frost - Free refrigerators B) Sub-marine propulsion C) Researches in superconductivity D) Rocket technology

Answer & Explanation Answer: D) Rocket technology

Explanation:

Cryogenic Engines find applications in Rocket technology. A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel or oxidizer, that is, its fuel or oxidizer are gases liquefied and stored at very low temperatures. Notably, these engines were one of the main factors of NASA's success in reaching the Moon by the Saturn V rocket.

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0 188
Q:

Which sources produce alternating current (AC)?

 A) Solar power plants B) Hydro-electric generators C) Batteries D) All of the above

Answer & Explanation Answer: B) Hydro-electric generators

Explanation:

Alternating Current (AC) is the current in which flow of current is altered periodically whereas in DC current i.e, direct current the flow of current is only in one direction.

Some of the sources of AC current are :

1. Hydro-electric generators

2. Thermal power generators

3. Nuclear  power generators...

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0 195
Q:

If velocity is constant then acceleration is what?

 A) constant B) increasing C) 0 D) infinite

Answer & Explanation Answer: C) 0

Explanation:

If an object moves with some velocity that means the magnitude and direction of the object changes i.e, the object moves with some acceleration. Hence, if the object moves with constant velocity, no change in direction and magnitude of speed i.e, no acceleration = 0 acceleration.

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1 239
Q:

A fixture is defined as a device which

 A) is used to check the accuracy of workpiece B) holds and locates a workpiece and guides and controls one or more cutting tools C) holds and locates a workpiece during an inspection or for a manufacturing operation D) All of the above

Answer & Explanation Answer: B) holds and locates a workpiece and guides and controls one or more cutting tools

Explanation:

A fixture is defined as a device which holds and locates a workpiece and guides and controls one or more cutting tools.

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