11th Physics Chapter 3 MCQs
11th Physics Chapter 3 MCQs. Class 11th Physics Chapter 3 Federal Board.
Tick the correct option.
1) A projectile thrown upward moves in its parabolic path, the velocity and acceleration vectors for the projectile are perpendicular to each other at:
A) no where
B) the highest point
C) the launch point
D) the landing point
Correct option is (b)
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2) A truck driving along a highway road has a large amount of momentum. If it moves at the same speed but has twice as much mass, its momentum is ________.
A) zero
B) quadrupled
C) doubled
D) unchanged
Correct option is (c)
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3) A 5 N force is applied to a 3 kg ball to change its velocity from
$$9\;m\;s^{-1}\;to\;3\;m\;s^{-1}\;.$$ This impulse causes the momentum change of ball to be ______ $$kg\;m\;s^{-1}\;.$$
A) -2.5
B) -10
C) -18
D) -45
Correct option is (c)
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4) Which of the following statements is true but the projectile motion?
A) Projectile motion is the motion of an object projected vertically upward into the air and moving under the influence of gravity.
B) Projectile motion is the motion of an object projected into the air and moving independently of gravity.
C) Projectile motion is the motion of an object projected into the air and moving under the influence of gravity.
D) Projectile motion is the motion of an object projected horizontally into the air and moving independently of gravity.
Correct option is (c)
Explanation:
Projectile motion is defined as the motion of an object projected into the air that moves under the influence of gravity alone (air resistance neglected).
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5) The vertical component of velocity of a projectile is smallest as:
A) The instant it is thrown.
B) Halfway to the top.
C) The top.
D) The landing point
Correct option is (c)
Explanation:
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In projectile motion, the vertical component of velocity decreases as the projectile rises.
-
At the highest point (top), the vertical component of velocity becomes zero, which is its smallest value.
-
After this, it increases in the downward direction.
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6) A 4 kg object has a momentum of
$$12\;kg\;m\;s^{-1}\;.$$ The object’s speed is:
$$\;A)3\;m\;s^{-1}\;\\B)\;4\;m\;s^{-1}\\C)\;12\;m\;s^{-1}\\D)\;48\;m\;s^{-1}$$
Correct option is (a)
7) A bomb of mass 9 kg explodes into 2 pieces of masses 3 kg and 6 kg. The velocity of mass 3 kg is
$$\;1.6\;m\;s^{-1},\\$$ the kinetic energy of mass 6 kg is:
A) 3.84 J
B) 9.6 J
C) 1.92 J
D) 2.92 J
Correct option is (b)
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8) What is the force experienced by a projectile after the initial force that launched it into the air, in the absence of air resistance?
A) The gravitational force
B) The nuclear force
C) The contact force
D) The electromagnetic force
Correct option is (a)
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9) If a projectile is launched on level ground, what launch angle maximize the range of the projectile?
A) 0 degree
B) 30 degree
C) 45 degree
D) 90 degree
Correct option is (c)
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