set 12 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Which of the following statements is/ are true?
  1. Absolute zero temperature is zero energy temperature.
  2. Two different gases at the same temperature pressure have equal root mean square velocities.
  3. The root mean square speed of the molecules of different ideal gases, maintained at the same temperature are the same.
  4. Given sample of 1cc of hydrogen and 1 cc of oxygen both at NTP; oxygen sample has a large number of molecules.

(a) 1, 3 and 4

(b) 2 and 3

(c) 1 only

(d) 2, 3 and 4

The correct answers to the above question in:

Answer: (c)

∈ = 3 2 RT;

T = 0,

∈ = 0

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

Which one among the following has the highest energy?

a) Red light

b) Green light

c) Blue light

d) Yellow light

Answer: (c)

Question : 2

Consider the following statements.

  1. A flute of smaller length produces waves of lower frequency.
  2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2

Answer: (a)

Question : 3

Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in

a) radiation

b) conduction

c) convection

d) none of these

Answer: (c)

Question : 4

Consider the following natural phenomena:

  1. Terrestrial heating
  2. Reflection of light
  3. Refraction of light
  4. Diffraction of light
Due to which of these phenomena is a mirage formed ?

a) 1 and 3

b) 1 and 2

c) 2, 3 and 4

d) 4 only

Answer: (a)

Convection currents of hot air rising off a surface have a lower density than the air directly above it.

The difference in density cause light passing through the air to refract differently, which causes the formation of mirage.

Question : 5

A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will

a) go on increasing

b) first increase and then decrease

c) first decrease and then increase

d) go on decreasing

Answer: (b)

The time period of simple pendulum T = 2π$√(l/g) ∝ √{l}$ where l is effective length. [i.e distance between the centre of suspension and centre of gravity of bob] Initially, the centre of gravity is at the centre of the sphere.

When water leaks the centre of gravity goes down until it is half filled; then it begins to go up and finally it again goes to the centre. That is effective length first increases and then decreases.

As T$∝ √l$, so time period first increases and then decreases.

Question : 6

The optimum sound level for human beings is

a) 60 dB

b) 120 dB

c) 90 dB

d) 100 dB

Answer: (a)

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