Physics Questions

Q:

Which of the following properties is found only in ferromagnetic materials ?

A) Susceptibility independent of temperature B) Point in a particular direction
C) Hysteresis D) Attracting a magnetic substance
 
Answer & Explanation Answer: C) Hysteresis

Explanation:
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Q:

What is unit of Astronomical distance ?

A) light year B) angstrom
C) weber D) lux
 
Answer & Explanation Answer: A) light year

Explanation:

angstrom is used to measure wave length,

weber is used to measure Magnetic flux,

lux is used to measure Intensity of illumination.

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Q:

For accurate scientific work, temperatures are often measured by

A) mercury thermometers B) alcohol thermometers
C) platinum resistance thermometers D) thermoelectric thermometers
 
Answer & Explanation Answer: C) platinum resistance thermometers

Explanation:

The resistance of metallic conductors e.g, platinum, increases with rise of  temperature . The increase in temperature results in a decrease of current which can be recorded in a galvanometer if the conductor is included in an electrical circuit. Thus the temperature can be known; platinum resistance thermometer is used generally for accurate scientific work. When two dissimilar metals are joined at the ends, and these ends are subjected to a difference of temperature, a current flows through the metals. Greater the difference of temperature , greater the current. So the curent strength can form the basis for measuring the difference in temperature. And when one of these temperatures is known, we can calculate the other.

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1 3052
Q:

A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A) a parabola B) a circle
C) a horizontal straight line D) a vertical straight line
 
Answer & Explanation Answer: A) a parabola

Explanation:

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

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2 3039
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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4 3029
Q:

Light is a ______________ wave.

 

A) longitudinal B) elastic
C) transverse D) mechanical
 
Answer & Explanation Answer: C) transverse

Explanation:
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Q:

Electrical Pressure is also called

A) Current B) Voltage
C) Resistance D) Power
 
Answer & Explanation Answer: B) Voltage

Explanation:

Electrical Pressure is also called as Voltage. Voltage is measured in Volts.

 

Volt : A unit of electrical pressure or Voltage is called Volt.

 

One volt is the amount of pressure required to cause one ampere of current to flow against one ohm of resistance.

 

Voltage is also referred to as Electromotive Force or Electrical Potential or Electrical Pressure.

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9 3017
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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