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Q:

No current will flow between two charged bodies if they have the same

A) resistance	B) charge
C) potential	D) charge/ potential ratio

Answer & Explanation Answer: C) potential

Explanation:

An electric charge always flows from a body at higher potential to a body at a lower potential irrespective of the amounts of charges contained in them. In the question , no current flows. So there is no potential difference.

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Q:

During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to

A) remain in the car	B) get out of the car and lie flat in the ground
C) abandon the car and take shelter under a nearby tree	D) touch the nearest electric pole

Answer & Explanation Answer: A) remain in the car

Explanation:

The Whole car - the body and inside - can be considered to be a hallow conductor. During the thunderstorm the body - i.e, the outside- gets a charge but there will be no charge inside. so the inside is safe.

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Q:

If a band is played on the moon the sound will

A) reverberate	B) be heard by us faintly
C) be heard upto 10 km from it	D) not be heard at any distance at all from it

Answer & Explanation Answer: D) not be heard at any distance at all from it

Explanation:

As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.

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Q:

When two similar sources vibrate with slightly different frequencies , a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

A) doppler effect	B) beats
C) resonance	D) echo

Answer & Explanation Answer: B) beats

Explanation:

Beats means the periodic increase and decrease in loudness heard when two notes of nearly the same frequency are sounded simultaneously.

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Q:

The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because

A) the ringing is not loud enough	B) the glass of the bell jar absorbs the sound waves
C) the bell jar is too small	D) there is no air or any other gas in the bell jar

Answer & Explanation Answer: D) there is no air or any other gas in the bell jar

Explanation:

As there is no medium inside the bell jar, sound cannot travel

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Q:

When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

A) the retina of the eye moves forward	B) the retina of the eye moves backward
C) the iris is unable to dilate the pupil immediately to be able to see things	D) the eye has no power of accommodation

Answer & Explanation Answer: C) the iris is unable to dilate the pupil immediately to be able to see things

Explanation:

The size of the pupil of the eye automatically adjusts itself according to the intensity of light passing through it;if the intensity is more , the size is less, if less, it is more. So in our case the pupil should dilate i.e, increase in size to be able to see in the dark . This switchover takes sometime. But here the entry into the dark room is immediate . So the eye has no time to adjust itself and hence is not able to see at all for a while.

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Q:

The image of an object formed on the retina of the eye is

A) virtual and upright	B) virtual and inverted
C) real and inverted	D) Real and upright

Answer & Explanation Answer: C) real and inverted

Explanation:

Although the image is inverted the mental interpretation of the effect on the retina is as though it is erect

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Q:

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A) the violet ray	B) the red ray
C) the green ray	D) the blue ray

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