Physics Questions

Q:

At what temperature (in Fahrenheit) pure water freezes?

A) 0 B) 17
C) 32 D) 39
 
Answer & Explanation Answer: C) 32

Explanation:

32oFWe know that T(°F) = T(°C) × 1.8 + 3232(°F) = 0(°C)

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Q:

The velocity required to place a vehicle in orbit round the moon is _______ that required to place it in orbit round the earth 

A) less than B) Greater than
C) equal to D) greater than or equal to
 
Answer & Explanation Answer: A) less than

Explanation:

This orbital velocity at the moon is less because orbital velocity = rg

 

where 'r ' is the orbital radius. i.e the distance of the body from the center of the earth and 'g' is the acceleration due to gravity on the body in question. In the case of the moon, both r and g are less than in the case of the earth.

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Q:

What frequency range is the high frequency band?

A) 3 kHz B) 3 to 30 MHz
C) 30 to 300 MHz D) 10 GHz
 
Answer & Explanation Answer: B) 3 to 30 MHz

Explanation:

The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.

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Q:

If price of an article decreases from P1 to Rs 25, quantity demanded increases from 900 units to 1200 units. If point elasticity of demand is ­2 find P1?

A) Rs. 20 B) Rs. 30
C) Rs. 25 D) Rs. 35
 
Answer & Explanation Answer: B) Rs. 30

Explanation:
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Q:

Which of the following is Not a form of Energy?

A) Heat B) Sound
C) Motion D) Pressure
 
Answer & Explanation Answer: D) Pressure

Explanation:

Pressure is Not a form of Energy.

 

Energy : It is defined as the ability to do work.

Energy comes in two basic forms. They are :

1. Potential Energy

2. Kinetic Energy

 

Potential Energy is any type of stored energy. It can be chemical, nuclear, gravitational, or mechanical.

Kinetic Energy is found in movement. An airplane flying or a meteor plummeting each have kinetic energy. Even the tiniest things have kinetic energy, like atoms vibrating when they are hot or when they transmit sound waves. Electricity is the kinetic energy of flowing electrons between atoms.

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Q:

The wavelength of a wave is the distance between

A) Crest and Trough B) Crest and Crest
C) Trough and Trough D) Both B & C
 
Answer & Explanation Answer: D) Both B & C

Explanation:

Distance between two Consecutive Crests or two Consecutive Troughs is called Wavelength. But the distance between crest and adjacent trough is half the wavelength.

That is the distance between adjacent crest and trough is called Half the wavelength.

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Q:

A spring is an example of which of these

A) Newton's 3rd law B) Hooke's law
C) Newton's 1st law D) Conservation of mass law
 
Answer & Explanation Answer: B) Hooke's law

Explanation:

When you compress or stretch a spring, as soon as the stress is relieved, the spring attains its normal shape instantly. Its Elastic potential energy helps it do so. Generally, these elastic substances follow the Hooke’s law.

 

According to this Law, the force needed to change the shape of spring is proportional to the displacement of the spring. The displacement referred here is how far the spring is compressed or stretched from its normal shape. Mathematically, Hook’s Law can be summarised as F= – k x. Here ‘k’ is the spring constant and ‘x’ is the displacement.

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Q:

Which of the following is the best conductor of electricity?

A) Aluminium B) Gold
C) Silver D) Copper
 
Answer & Explanation Answer: C) Silver

Explanation:

silver is the best conductor of electricity.

When compared to remaining 3 metals, as Silver having more number of free electrons in its valency shell it is the good conductor of electricity.

Conductors Thermal Conductivity @ 25degree C

Silver --- 429
Copper --- 401
Gold --- 310
Aluminium --- 250

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