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Q:

Which of the following never occurs singly in nature?

A) Inertia B) Momentum
C) Force D) Velocity
 
Answer & Explanation Answer: C) Force

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Q:

Even after sunset, the air near the Earth's surface continue to receive heat due to

A) Insolation B) Terrestrial Radiation
C) Conduction D) Convection
 
Answer & Explanation Answer: B) Terrestrial Radiation

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Q:

What is the name of the device used to convert alternating current into direct current ?

A) Ammeter B) Galvanometer
C) Rectifier D) Transformer
 
Answer & Explanation Answer: C) Rectifier

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Q:

The strain produced in a body is directly proportional to the stress applied on it, is called _______.

A) Dollar's law B) Hooke's law
C) Miller's law D) Kepler's law
 
Answer & Explanation Answer: B) Hooke's law

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Q:

Supercooling is cooling of liquid _____.

A) below melting point B) below freezing point
C) at melting point D) above melting point
 
Answer & Explanation Answer: B) below freezing point

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Q:

Which of the following is not true about X­rays?

A) have low penetrating power B) travel with the speed of light
C) Can be reflected or refracted D) can affect photographic plates
 
Answer & Explanation Answer: A) have low penetrating power

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Q:

Which of the following describes an electric motor?

A) Is found in many appliances with moving parts, like a vacuum cleaner or a blender. B) Changes electric energy to mechanical energy.
C) Uses the interaction between a spinning coil of wire and magnet. D) Can be powered by a hand crank.
 
Answer & Explanation Answer: B) Changes electric energy to mechanical energy.

Explanation:

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

                                   Which_of_the_following_describes_an_electric_motor1596165769.jpg image

Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. 

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Q:

The slope of a Distance­Time graph shows ___________.

A) acceleration B) momentum
C) mass D) speed
 
Answer & Explanation Answer: D) speed

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