set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on modern and space physics, sources of energy topic of general science mcq
| Column I | Column II |
| A. Isotopes | 1. Mass number same but different atomic number. |
| B. Isobars | 2. Atomic number same but different mass number. |
| C. Isotones | 3. Number of nentrons plus number of protons. |
| D. Nucleons | 4. Number of nentrons same but different atomic number. |
(a) (A) → (2); (B) → (1); (C) → (4); (D) → (3)
(b) (A) → (1); (B) → (2); (C) → (3); (D) → (4)
(c) (A) → (3); (B) → (1); (C) → (2); (D) → (4)
(d) (A) → (1); (B) → (3); (C) → (2); (D) → (4)
The correct answers to the above question in:
Answer: (a)
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Question : 1
Which one of the following is the correct sequence of the wavelengths of radiations ?
a) IR > Green > UV > Hard X-rays
b) UV > Hard X-rays > IR > Green
c) UV > Green > IR > Hard X-rays
d) IR > Hard X-rays > Green> UV
Answer »Answer: (a)
IR > Green > UV > Hard X-rays
Question : 2
Consider the following statements: A person in a spaceship located half way between the earth and the sun will notice that the :
- sky is jet black.
- stars do not twinkle.
- temperature outside the spaceship is much higher than that on the surface of the earth.
a) 1 and 2
b) 1 and 3
c) 3 only
d) 1, 2 and 3
Answer »Answer: (d)
There is a presence of atmosphere at earth’s surface which consists of thick and moving layers of air. The dust particles, particulates, smog, water vapour and smoke are also present in air.
Stars twinkle when we see them from the Earth’s surface because we are viewing them through thick layers of turbulent (moving) air in the Earth’s atmosphere.
As their light travels through the many layers of the Earth’s atmosphere, the light of the star is bent (refracted) many times in random directions (light is bent when it hits a change in density –like a pocket of cold air or hot air). This random refraction results in the star as its twinkling but for a person in spaceship no such refractions are possible as there is vaccum in space.
Thus, star will not twinkle.
Similarly, sky will appear blue to us due to Rayleigh scattering which is again due to presence of atmosphere on earth’s surface. The shorter wavelength light is absorbed by the gas molecules of atmosphere. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Some of this scattered blue light reaches you.
Since, you see , the sky looks blue. Whereas no atmosphere is there in space thus, no absorbing and scattering is possible that’s why for a person in spaceship sky appears black.
Temperature outside the spaceship is higher in comparison to earth’s surface because of being nearer to sun.
Question : 3
Television signal cannot be received generally beyond a particular distance due to
a) weakness of antenna
b) weakness of signal
c) curvature of the Earth
d) absorption of signal in air
Answer »Answer: (c)
Question : 4
Select the correct statement(s) from the following.
- In conductors, the valence and conduction bands may overlap.
- Substances with energy gap of the order of 10 eV are insulators.
- The resistivity of a semiconductor increases with increase in temperature.
- The conductivity of a semiconductor increases with increase in temperature.
a) I and III only
b) I, II and IV
c) I and II only
d) I, II, III and IV
Answer »Answer: (b)
Question : 5
Solar cells generate little amount of electricity, but are becoming popular because
a) it can be set up in remote and inaccessible hamlets without laying transmission lines
b) electricity generated from solar cells can be stored and used when required
c) its raw material Silicon is available in large quantities in India
d) All of these
Answer »Answer: (d)
Question : 6
Consider the following statements in respect of India advanced satellite INSAT–4A:
- INSAT-4A was launched in December, 2005 from New Mexico.
- The European Commercial Launch Service Provider Arianespace was associated with the launch of INSA T-4A.
- Tata-Sky; a digital cable service provider; is associated with DTH television broadcasting service from INSA T 4A.
a) 1 and 2
b) 2 and 3
c) 1, 2 and 3
d) 1 and 3
Answer »Answer: (b)
Statement ‘2’ & ‘3’ is correct, but ‘1’ is incorrect. Because INSAT–4A was launched on 22 December 2005 from French Guiana.
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