611. The frame of reference in which Newton’s first law of motion holds is known as:
A. Inertial frame of reference
B. Non-Inertial frame of reference
C. Every frame of reference
D. Earth frame of reference
612. At the top of the trajectory of a projectile, the acceleration is:
A. The maximum
B. The Minimum
C. Zero
D. G
613. A boy is dropped from a tower with zero velocity, reaches the ground in 4 seconds. The height of the tower is about:
A. 80 Meters
B. 20 Meters
C. 160 Meters
D. 40 Meters
614. Unit of impulse in:
A. Newton
B. KG M
C. KG M/S
D. Joule
615. Aluminium has __ % share in the composition of earth.
(A) 6.23%
B) 8.23%
(C) 10.23%
(D) 12.23%
616. A stone is projected vertically upwards from the ground at an initial speed of 15m/s, air resistance is negligible. What is the maximum height reached by the stone?
(A) 0.76 m
B) 11 m
(C) 23 m
(D) 110 m
617. When an object is thrown upward, it rises to height ‘h’. How high is the object in terms of h, when it has lost one third of its original Kinetic Energy?
(A) h
(B) h/2
(C) h/3
D) h/4
618. As the pressure in an ideal gas is increased isothermally, the average molecular speed:
(A) Increases
(B) Increases at high temperature, decreases at low.
(C) Decreases at high temperature
D) Stays the same
619. A radioactive atom X emits a Beta – Particle. The resulting atom:
(A) Must be very reactive chemically.
B) Has an atomic number that is one more than that of X
(C) Has a mass number that is one less than that of X
(D) Must be radioactive
620. A virtual image is one?
(A) Toward which light rays converge but do not pass through.
(B) Toward which light rays converge and pass through.
C) From which light rays diverge but do not pass through.
(D) From which light rays diverge as they pass through.
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