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 Physics Questions

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Q:

Radiocarbon is produced in the atmosphere as a result of

A) collision between fast neutrons and nitrogen nuclei present in the atmosphere B) action of ultraviolet light from the sun on atmospheric oxygen
C) action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere D) lightning discharge in atmosphere
 
Answer & Explanation Answer: A) collision between fast neutrons and nitrogen nuclei present in the atmosphere

Explanation:
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Q:

The Hooke's law is valid for

A) only proportional region of the stress strain curve B) entire stress strain curve
C) entire elastic region of the stress strain curve D) elastic as well as plastic region of the stress strain curve
 
Answer & Explanation Answer: A) only proportional region of the stress strain curve

Explanation:

Hooke's law states that within the elastic limit, stress developed is directly proportional to the strain produced in a body.Hooke’s law is valid only in the linear part of stress-strain curve. Hence, statement 1 is correct.

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Q:

Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

A) P B) 3P
C) p/3 D) 2p/ 3
 
Answer & Explanation Answer: B) 3P

Explanation:

P= I^2.R where, I= Current, P= Electric Power, R=Resistance. Here all the resistance is put in parallel combination and in parallel combination the value of Resistance decreases and dissipation of power increase, hence 3 times more power will be dissipated(3P).

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Q:

Which of the following is a compound machine?

A) Screw B) Knife
C) Bicycle D) Ramp
 
Answer & Explanation Answer: C) Bicycle

Explanation:

Bicycle is a compound machine in the above given options. A compound machine is a machine that is formed by two or more simple machines.

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2 2528
Q:

Which of the following causes adiabatic temperature changes in atmosphere?

A) Deflection and advection B) Latent heat of condensation
C) Expansion and compression of the air D) Partial absorption of solar radiation by the atmosphere
 
Answer & Explanation Answer: C) Expansion and compression of the air

Explanation:

Application of temperature changes in the atmosphere is in adiabatics, or temperature change which are caused by compressing or allowing air to expand.

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Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm B) 500 nm and 1000 nm
C) 500 nm only D) 200 nm and 1000 nm
 
Answer & Explanation Answer: C) 500 nm only

Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
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Q:

Land is considered a resource because it

A) is used to produce things B) requires labor to be useful
C) is always available to use D) costs little or nothing to use
 
Answer & Explanation Answer: A) is used to produce things

Explanation:

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

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Q:

Cast iron during machining produces

A) Discontinuous chips B) Continuous chips with build up edge
C) Continuous chips D) All of the above
 
Answer & Explanation Answer: A) Discontinuous chips

Explanation:

Cast iron is a group of iron-carbon alloys with a carbon content greater than 2% and is a brittle material.

cast_iron_during_machining_produces1545889160.jpg image


Its usefulness derives from its relatively low melting temperature.

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