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Q:

People living in Sweden generally belong to

A) Mediterranean B) Alpine
C) Nordic D) Mongoloid
 
Answer & Explanation Answer: C) Nordic

Explanation:
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Filed Under: World Geography

Q:

Air pressure is usually highest when the air is 

A) warm and moist B) cool and dry
C) warm and dry D) cool and moist
 
Answer & Explanation Answer: D) cool and moist

Explanation:

Both warmth and moisture reduce the density of air and hence its pressure is high.

                                  Air_pressure_is_usually_highest_when_the_air_is1558073685.png image

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Filed Under: Physics
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Q:

When an electric bulb breaks , there is an explosive sound. That is due to

A) the chemical reaction between the gases inside the bulb B) the compressed gases inside rushing out suddenly
C) the air outside rushing in to fill the vacuum inside the bulb D) None of these
 
Answer & Explanation Answer: C) the air outside rushing in to fill the vacuum inside the bulb

Explanation:

The inside of the bulb being a vacuum, the outside air rushes in when the bulb is broken. The vibrations of the rushing air molecules produce the sound.

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Filed Under: Physics

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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Filed Under: Physics

Q:

An integrated circuit is more advantages than a coventional circuit because 

A) they make the electric equipments more reliable and easier for servicing B) a faulty part of a conventional circuit may be difficult to locate and repair
C) if a part of the integrated circuit fails the entire circuit is simply replaced D) all the above
 
Answer & Explanation Answer: D) all the above

Explanation:

Integrated circuit (IC) is a tiny device that controls electric signals in such electronic equipments as computers and T.V sets. Many integrated circuits contain thousands of electronic parts on a paper - thin chip of silicon. These parts include capacitors, diodes, all in a very small, compact space.

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Filed Under: Physics

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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Filed Under: Physics

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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Filed Under: Physics

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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Filed Under: Physics