871. If the time of the flight of a projectile is doubled. What happened to the maximum height attained?
(A) Doubled
(B) Remains unchanged
C) Becomes four times
(D) Halved
872. A person can throw a stone to a maximum distance of 100m. The greatest height to which throw the stone is?
(A) 10m
B) 25m
(C) 75m
(D) 100m
873. In projectile motion at the highest point?
(A) Velocity is maximum
(B) Velocity is zero
(C) Only the horizontal component of velocity is zero
D) Only the vertical component of velocity is zero
874. A body is dropped from a tower with zero velocity and reaches the ground in 4 seconds. The height of the tower is about?
(A) 20m
(B) 40m
C) 80m
(D) 160m
875. Powered and remote control guided missiles are used for?
(A) Short ranges
(B) Medium ranges
(C) Very short ranges
D) Long ranges
876. For long-range, the missiles used are called?
(A) Long-range missiles
(B) Normal missiles
(C) Rocket missiles
D) Guided missiles
877. When a diamagnetic substance is inserted in a current-carrying coil, the magnetic field:
A. Decreased
B. Unchanged
C. Increased
D. First Increase then decrease
878. The time required for a charged particle to make a complete revolution in a magnetic field does not depend upon:
A. Its mass
B. Its Charge
C. Its Energy
D. The magnetic flux density
879. The fact that an electric field is produced in a conductor whenever magnetic lines of force move across it is referred to as:
A. Ampere’s law
B. Ohm’s law
C. Faraday’s law
D. Lenz’s law
880. The law of conservation has an effect on Lenz’s law:
A. Charge
B. Momentum
C. Lines of force
D. Energy
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