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 Physics Questions

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Q:

The resistance of a conductor is inversely proportional to its:

A) length B) resistivity
C) temperature D) area of cross section
 
Answer & Explanation Answer: D) area of cross section

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2 1892
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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1 1892
Q:

If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

A) Concave B) Convex
C) Cylindrical D) Plane
 
Answer & Explanation Answer: A) Concave

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3 1891
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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0 1890
Q:

___________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system.

A) First law of thermodynamics B) Hooke's Law
C) The coulomb's law D) Faraday's Law
 
Answer & Explanation Answer: A) First law of thermodynamics

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1 1889
Q:

Convex mirror is generally used in _____.

A) solar cookers B) opthalmoscope
C) reflector for head light D) rear view mirror
 
Answer & Explanation Answer: D) rear view mirror

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1 1887
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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0 1884
Q:

In science a push or pull of an object is called ________.

A) Pick B) Lift
C) Force D) Shut
 
Answer & Explanation Answer: C) Force

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0 1884