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The following question based on electric current and magnetism topic of general science mcq
(a) behaves like a diamagnetic material
(b) is permanently magnetized
(c) remains ferromagnetic
(d) behaves like a paramagnetic material
The correct answers to the above question in:
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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Read more physics gk Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
If the focal length of the biconvex lens is 25 cm, then the power of the lens will be
a) + 0.04 dioptre
b) + 4 dioptre
c) – 4 dioptre
d) – 0.04 dioptre
Answer »Answer: (b)
Question : 4
Which of the statements is true for p-type semiconductos?
a) Electrons are minority carriers and pentavalent atoms are the dopants.
b) Holes are minority carriers and pentavalent atoms are the dopants.
c) Electrons are majority carriers and trivalent atoms are the dopants.
d) Holes are majority carriers and trivalent atoms are the dopants.
Answer »Answer: (d)
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