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Physics Objective
Quiz 1
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Q.1
Which of the following is the mathematical representation of law of conservation of total linear momentum?
a) dP/dt = 0
b) dF/dt = 0
c) dP/dt = Finternal
d) dF/dt = P
Q.2
A ball of mass 2kg is moving with a speed of 10m/s along a flat surface. It collides with another ball of mass 3kg and comes to rest, what will be the speed of the second ball after collision?
a) The above said situation is not possible
b) 20m/s
c) Zero
d) 6.67m/s
Q.3
On collision of two balls linear momentum is conserved, it implies that even kinetic energy will remain conserved. True or False?
a) True
b) False
Q.4
In the given figure, ball 1 has an initial velocity of 5m/s. Ball 2 is initially at rest. After collision ball 2 moves with a speed of 2m/s in the direction shown & ball 1 moves at an angle A. What is the value of angle A?
a) tan-1(1/3√3)
b) sin-1(1/3√3)
c) tan-1(1/√3)
d) tan-1(√3)
Q.5
A radioactive particle at rest, having mass 10g, breaks into 2 fragments (1&in the mass ratio 2:3 respectively. If the first one moves with a velocity of 10m/s what will be the speed of the second particle?
a) 4.33 m/s
b) -4.33 m/s
c) -6.67 m/s
d) 6.67 m/s
Q.6
There are two external forces acting on a system of particles. Select the correct statement.
a) Linear momentum is necessarily not conserved
b) Linear momentum may be conserved
c) Linear momentum is zero
d) Centre of mass will move with increasing speed
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