General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
11. Consider the following differences between Physisorption and Chemisorptions:
- While physisorption occurs at low temperature, chemisorption occurs at high temperature
- While physisorption is a reversible process, chemisorption is an irreversible process
Which of the above statements is/are correct?
[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [ Both 1 & 2]
Notes:
Both are correct statements
12. Consider the following differences between White Gold and Yellow Gold:
- White gold has more zinc, whereas yellow gold usually contains more nickel
- Rhodium coating on white gold makes it more expensive than yellow gold
Which of the above statements is/are correct?
[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [ Both 1 & 2]
Notes:
Both are correct statements
13. Consider the following statements about the Coalbed Methane:
- It is called 'sweet gas' because of its lack of hydrogen sulphide
- It contains very little heavier hydrocarbons such as propane or butane
Which of the above statements is/are correct?
[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 & 2]
Notes:
Both are correct statements
14. What will be the change in the force of attraction between two bodies if the distance between them is doubled?
[A] No change
[B] Becomes double
[C] Becomes less by four times
[D] Becomes nine times
Show Answer
Correct Answer: C [Becomes less by four times]
Notes:
If the distance between two masses is doubled, the gravitational attraction between them becomes 1/4 times. F = Gm1m2/r2
15. Which of these statements is correct about the energy of a satellite:
[A] Potential energy= – 2 (Kinetic energy)
[B] Potential energy= 2 (Kinetic energy)
[C] Potential energy= – 3 (Kinetic energy)
[D] Potential energy= – (Kinetic energy)
Show Answer
Correct Answer: A [Potential energy= – 2 (Kinetic energy)]
Notes:
Potential energy of a satellite: -L2/mr2 Potential energy of a satellite: -L2/2mr2 Therefore, Potential energy= – 2 (Kinetic energy)
16. Which of the following is NOT an example of capillary action?
[A] Rise of ink in the fine pores of blotting paper
[B] soaking of water by a towel
[C] Wood swells in rainy season due to rise of moisture
[D] None of the above
Show Answer
Correct Answer: D [None of the above]
Notes:
Examples of capillarity : (i) Ink rises in the fine pores of blotting paper leaving the paper dry. (ii) A towel soaks water. (iii) Oil rises in the long narrow spaces between the threads of a wick. (iv) Wood swells in rainy season due to rise of moisture from air in the pores.
17. Which of the following is correct about the electromagnetic waves?
[A] They require a solid medium to travel
[B] They can travel through vacuum
[C] Electromagnetic waves can only travel through gases
[D] None of the above
Show Answer
Correct Answer: B [They can travel through vacuum]
Notes:
Electromagnetic waves do not necessarily require a medium – they can travel through vacuum. Light, radio waves, X-rays, are all electromagnetic waves.
18. Which of the following is NOT a mechanical wave?
[A] Sound wave
[B] Seismic wave
[C] Light wave
[D] Water waves
Show Answer
Correct Answer: C [Light wave]
Notes:
Sound wave, seismic wave and water waves are mechanical waves whereas light wave is an electromagnetic wave.
19. What is the barrier potential for Germanium?
[A] 0.3 V
[B] 0.7 V
[C] 1 V
[D] 1.7 V
Show Answer
Correct Answer: A [0.3 V]
Notes:
The barrier potential is characteristic of the semiconductor material. It is about 0.3 V for Germanium.
20. What is dry ice?
[A] solidified form of Carbon dioxide
[B] frozen heavy water
[C] isotope of Hydrogen
[D] popular name of Benzene
Show Answer
Correct Answer: A [solidified form of Carbon dioxide]
Notes:
Carbon dioxide can be obtained as a solid in the form of dry ice by allowing the liquified CO2 to expand rapidly.
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