Which material rod is often used to make electromagnets?
(A) Steel
(B) malleable iron
(C) Brass
(D) None of these
How does pupil come in bright light?
(A) big
(B) small
(C) No change
(D) None of these
Which of the following substances cannot be used for lenses?
(A) Water
(B) Soil
(C) Plastic
(D) glass
Which of the following unit is Newton?
(A) force
(B) Displacement
(C) distance
(D) energy
The small hole in the middle of the iris is called?
(A) pupil
(B) blood plate
(C) Retina
(D) frontend
Which metal is used to make a solar cell?
(A) Steel
(B) Silicon
(C) Abarkha
(D) glass
Which of the following is not used as cooking fuel?
(A) LPG
(B) Biogas
(C) CNG
(D) Coal
According to which principle does the electric motor work?
(A) Ohm's law
(B) Lenz's law
(C) Faraday's law
(D) None of these
Which of the following metals is used as a semiconductor in transistors?
(A) Silver
(B) Graphite
(C) Germanium
(D) All of these
What is a Coolidge tube used to produce?
(A) Micro waves
(B) Radio waves
(C) X Rays
(D) None of these
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