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Q:

When a ray of light is  refracted by a prism such that the angle of deviation is minimum then

A) the angle of emergence is equal to the angle of incidence B) the angle of emergence is greater than the angle of incidence
C) the angle of emergence is smaller than the angle of incidence D) the sum of the angle of incidence and the angle of emergence is equal to 90 degrees
 
Answer & Explanation Answer: A) the angle of emergence is equal to the angle of incidence

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Filed Under: Physics

Q:

If a sound travels from air to water, the quantity that remain unchanged is

A) velocity B) frequency
C) wavelength D) amplitude
 
Answer & Explanation Answer: B) frequency

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Filed Under: Physics

Q:

Ultrasonic waves are used for stirring liquid solutions because they 

A) do not produce noise during the operation B) are easy to produce
C) can produce perfectly homogeneous solutions D) do not produce chemical reactions in the solution
 
Answer & Explanation Answer: C) can produce perfectly homogeneous solutions

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Q:

A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated , it will

A) remain straight B) bend towards right
C) bend towards left D) none of these
 
Answer & Explanation Answer: C) bend towards left

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Q:

Heat is associated with

A) K.E of random motion of molecules B) K.E of orderly motion of molecules
C) Total K.E of random and orderly motion of molecules D) None of these
 
Answer & Explanation Answer: A) K.E of random motion of molecules

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Q:

A ball is thrown vertically upwards. Assuming the air resistance to be constant and cosiderable:

A) the time of ascent < the time of descent B) the time of ascent > the time of descent
C) the time of ascent = the time of descent D) none of these
 
Answer & Explanation Answer: A) the time of ascent < the time of descent

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Q:

A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving:

A) forward and loosing speed B) forward and gaining speed
C) forward and uniform speed D) backward with uniform speed
 
Answer & Explanation Answer: B) forward and gaining speed

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Q:

The International Development Association, a lending agency, is administered by the

A) International Bank for Reconstruction and Development B) International Fund for Agricultural Development
C) United Nations Development Programme D) United Nations Industrialized Development Organization
 
Answer & Explanation Answer: A) International Bank for Reconstruction and Development

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Filed Under: World Organisations