851. The angle of projection to cover the maximum horizontal range is?
(A) 18 Degree
B) 45 Degree
(C) 90 Degree
(D) 120 Degree
852. The total time for which a projectile remains in the air is called?
(A) Time of projectile
(B) Time period
C) Time of flight
(D) Time constant
853. When the projectile reaches the highest point of the trajectory. The vertical component of velocity becomes?
A) Zero
(B) Maximum
(C) Minimum
(D) Infinity
854. A body thrown upward making a certain angle with the horizontal and moving freely under the action of gravity is called?
(A) Satellite
(B) Rocket
C) Projectile
(D) Spaceship
855. Which shows the correct relation between H and T of projectile?
A) H=gT²/8
(B) H=8/gT²
(C) H=8g/T²
(D) None of the above
856. Which among the following is a vector quantity?
A) Velocity
(B) Potential energy
(C) Work
(D) All above are vector quantities
857. Which among the following is a scalar quantity?
(A) Force
B) Speed
(C) Acceleration
(D) Velocity
858. A snooker ball moving with velocity v collides head-on with another snooker ball of the same mass at rest. If the collision is elastic, the velocity of the second snooker ball is?
(A) Zero
B) V
(C) 2V
(D) Infinitely
859. An observer moves past a stationary electron on the earth’s surface. His instruments measure:
A. Only an electric Field
B. Only a magnetic Field
C. Both Electric and Magnetic Field
D. Neither electric nor magnetic field
860. Relative to the original photon, the photon that emerges from a collision with an electron has:
A. More Energy
B. More Momentum
C. Higher Frequency
D. Longer Wavelength
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