light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

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Question : 16 [UPPCS (Pre) 1998]

Wireless communication is reflected back to the Earth’s surface by the

a) Ionosphere

b) Stratosphere

c) Troposphere

d) Exosphere

Discuss »

Answer: (a)

Question : 17

Match List I with List II and select the correct answer using the codes given below the lists

List I List II
A. Isothermal process 1. Volume of the system remains constant
B. Adiabatic process 2. Pressure of the system remains constant
C. Isobaric process 3. Temperature of the system remains constant
D. Isochoric process 4. No heat transfer takes place between the system and the surrounding
Choose the correct option from the codes given below :

a) A – 3, B – 4, C – 2, D – 1

b) A – 2, B – 3, C – 4, D – 1

c) A – 2, B – 1, C – 4, D – 3

d) A – 4, B – 3, C – 1, D – 2

Discuss »

Answer: (a)

Question : 18 [RAS/RTS (Pre) 2008]

On a specific day and time, the temperature was 48ºC in Churu and 24ºC in Shimla. Two metallic cups identical in all respects contained water at 95ºC in Churu and 71ºC in Shimla. Which one of these two cups reached room temperature first?

a) Cup in Shimla

b) Both cups reached room temperature at the same time

c) Cup in Churu

d) Data are not enough to find out result

Discuss »

Answer: (b)

Question : 19

Consider the following statements :

  1. 1 gram of water at 100°C and 1 gram of steam at 100°C contain same amount of heat.
  2. 1 m3 of dry air is heavier than 1 m3 of humid air.
  3. Density of a substance in C.G.S. system is numerically equal to its specific gravity.
Which of the statements given above is /are correct ?

a) 1 and 3

b) 3 only

c) 1 only

d) 2 and 3

Discuss »

Answer: (b)

(1) 1 gram of steam at 100°C contains greater amount of heat in comparison to 1 gram of water at 100°C. Thus, statement (1) is incorrect.

(2) 1 m3 of humid air is heavier than 1m3 of dry air. Thus, statement (2) is incorrect.

(3) Density of a substance in C.G.S. system is numerically equal to its specific gravity. Thus, statement (3) is correct.

Question : 20

The marching soldiers break steps while crossing a bridge because of

a) echo

b) damped oscillations

c) resonance

d) reverberation

Discuss »

Answer: (c)

IMPORTANT general science mcq EXERCISES

set 14 Online Quiz

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1652 heat wave motion sound optics oscillations based general science mcq set 14 question answer pdf
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