Physics Questions

Q:

Two bodies A and B are of same mass and same amount of heat is given to both of them. If the temperature of A increases more than that of B because of heat addition, then

 

A) the specific heat capacity of A is more than that of B B) the specific heat capacity of A is less than that of B
C) both A and B have the same specific heat capacity but A has greater thermal conductivity D) both A and B the same specific heat capacity but B has greater thermal conductivity
 
Answer & Explanation Answer: B) the specific heat capacity of A is less than that of B

Explanation:
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Q:

The capacity of a pure capacitor is 1 farad. In D.C circuit, its effective resistance will be

A) Zero B) Infinite
C) 1 Ohm D) 1/2 Ohm
 
Answer & Explanation Answer: B) Infinite

Explanation:
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29 9178
Q:

Unit of solid angle is

A) degree B) radian
C) steradian D) radian second
 
Answer & Explanation Answer: C) steradian

Explanation:
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20 9150
Q:

Where should a boat compass be mounted?

A) near magnet B) near iron
C) away from electrical wiring D) All the above
 
Answer & Explanation Answer: C) away from electrical wiring

Explanation:

A compass, which is used to assist in navigation, is an instrument that shows magnetic north. You must apply a correction to determine the direction of true north. The ability to steer a boat by a compass is useful if land is out of sight, visibility is reduced, or the boat operator is disoriented.

 

Mount a boat compass away from iron, magnets, and electrical wiring and equipment.

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Q:

At the Curie temperature, the ferromagnetic materials get converted into

A) Diamagnetic materials B) Non-magnetic materials
C) Paramagnetic materials D) None of the others
 
Answer & Explanation Answer: C) Paramagnetic materials

Explanation:
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18 9030
Q:

What is the main function of an ignition safety switch?

Answer

An ignition safety switch is a safety device can shut off the engine if the operator falls off the PWC or out of the powerboat, or is otherwise thrown from the proper operating position.


 


How it works:


It allows the engine of the vehicle to shut off or to be turned off immediately as it is to prevent further complications to happen as this is being used when an emergency is launched


 


Where it is used:


Most powerboats and PWCs come equipped by the manufacturer with an emergency engine cut-off switch.

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Q:

Which of the following is a vector quantity

A) momentum B) pressure
C) Energy D) work
 
Answer & Explanation Answer: A) momentum

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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