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The following question based on electric current and magnetism topic of general science mcq
(a) + 0.04 dioptre
(b) + 4 dioptre
(c) – 4 dioptre
(d) – 0.04 dioptre
The correct answers to the above question in:
Answer: (b)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Yellow colour light is used as fog light because yellow colour
a) has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red
b) light is most scattered by fog
c) has the longest wavelength among all colours
d) has the shortest wavelength among all colours not already reserved for other purpose
Answer »Answer: (a)
Question : 2
The magnetism of magnet is due to
a) pressure of big magnet inside the earth
b) the spin motion of electron
c) earth
d) cosmic rays
Answer »Answer: (b)
Question : 3
In comparison to an electric bulb, a fluorescent tube is preferred because
a) In the tube, electric energy almost converted into light energy
b) It has greater external outer surface to radiate/emit the light
c) There is no effect of voltage fluctuation on it
d) None of the above
Answer »Answer: (d)
Question : 4
The frequency of A.C. mains in India is
a) 50 c/s
b) 60 c/s
c) 30 c/s
d) 120 c/s
Answer »Answer: (a)
Question : 5
Match list-I with list -II:
List I | List II |
A. Greek word for Amber | 1. Electric discharge |
B. Positively charged particle | 2. Flow of charge |
C. Cause of lightning | 3. Electron |
D. Electric current | 4. Proton |
a) A – 4 ; B – 3 ; C – 2 ; D – 1
b) A – 3 ; B – 1 ; C – 2 ; D – 4
c) A – 4 ; B – 2 ; C – 3 ; D – 1
d) A – 3 ; B – 4 ; C – 1 ; D – 2
Answer »Answer: (d)
A → 3; B → 4; C → 1; D → 2
- Electron is the greek work for Amber.
- Proton is a positively charged particle.
- Electric discharge is the cause of lightning.
- Flow of electron causes electric current.
Question : 6
When a ferromagnetic material is heated to temperature above its Curie temperature, the material:
a) behaves like a diamagnetic material
b) is permanently magnetized
c) remains ferromagnetic
d) behaves like a paramagnetic material
Answer »Answer: (d)
At a particular temperature, known as curie temperature, ferromagnetic material changes over to paramagnetic material.
The ferromagnetic effects weaken with increasing temperature because random thermal motions tend to destroy the alignment of the magnetic dipole moments.
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