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Q:

Energy is continuously generated in the sun due to

A) Nuclear fusion B) Nuclear fission
C) Radioactivity D) Artificial radioactivity
 
Answer & Explanation Answer: A) Nuclear fusion

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Q:

Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then

A) the brighter bulb has smaller resistance B) the brighter bulb has larger resistance
C) both the bulbs have the same resistance D) none of these
 
Answer & Explanation Answer: A) the brighter bulb has smaller resistance

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Q:

When light enters from air to water, then its 

A) frequency increases and speed decreases B) frequency is same but the wavelength is smaller in water than in air
C) frequency is same but the wavelength is larger in water than in air D) frequency and speed both decreases
 
Answer & Explanation Answer: B) frequency is same but the wavelength is smaller in water than in air

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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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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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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 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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