🌿. A free-hanging magnet always stays (fixed) that direction is
🌿. A ray of light on a polished surface after hitting the surface and returning to the same medium is called: (a) diffraction (b) refraction (c) rarefaction (d) reflection
🌿. Which of the following is repelled by a magnet?
(a) radio waves (b) ultraviolet rays
(c) beta-rays (d) UV-rays
🌿. The correct sequence of four strokes in
a fourstroke engine is : (a) compression, power, intake, exhaust
(b) power, intake, exhaust, compression
(c) intake, power, compression, exhaust
(d) intake, compression , Power, Exhaust [RRB Ahmedabad DD/SPW Exam 17 . 10 . 04 ]
🌿. The magnetism of a temporary magnet is lost
(a) when the magnetizing force is less
(b) when the magnetizing force is removed
(c) when the magnetizing force remains the same
(d) when the magnetizing force does not move
🌿. What is the unit of magnetic flux?
(a) ampere turn (b) coulomb
(c) newton (d) weber
🌿. The electromagnetic unit of flusk is-
(a) Beaver (b) Gauss
(c) Tesla (d) None of these
🌿. The SI unit of magnetic field is-
(a) Gauss (b) Tesla
(c) Pascal (d) None of these
🌿. Fleming’s right hand rule is used to find the direction of
(b) Involved E. M. F.
(d) None of these
🌿. A hole has a ______ coulomb of charge.
(a) 1.6 × 10 – 9 (b) 1.6 × 10 –19
(c) 1.6 (d) None of these
🌿. What does an electromagnet produce?
(a) Permanent magnet
(b) Temporary magnetic field
(c) Electric field
(d) None of these
🌿. Soft magnetic material is-
(a) Tungsten (b) Brass
(c) Copper (d) Iron
🌿. Which of the following would be best suited for making an electromagnet?
(a) Copper (b) Tungsten
(c) Soft (d) Steel
🌿. The strength of the magnetic field on increasing the number of turns in the coils :
(c) first decreases then increases
(d) remains unchanged
🌿. Which of the following electromagnetic wave will have the greatest wavelength?
(a) 3.66 ×10 3 m (b) 3.66 ×10 2 m
(c) 1.74 ×10 6 m (d) 2.4 ×10 –2 m
🌿. A stationary magnet always shows-
(a) north-north and south-south
(b) north-south and south-north
(c) east-east and west-west
(d) none of these
Ans: (b) )
🌿. Which of the following is a non-magnetic object?
(a) Iron (b) Sulfur
(c) Nickel (d) Cobalt
🌿. How many points are there in the navigational compass?
(a) 64 (b) 32
(c) 24 (d) 8
🌿. If a bar magnet is broken into two pieces, then-
(a) both will be a magnet with north spine at one end and south spine at the other end
(b) both the pieces will lose their magnetism
(c) long The piece will act as a bar magnet. Magnetism
(d) One piece will have North spine on both sides and the other piece will have South spine on both sides