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Quiz 42
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821. Two stones of 10 kg and 50 kg fall through an 80 m high cliff. Which stone has maximum velocity at the bottom? (g = 10 m/s²)
10 kg
50 kg
Both have same velocity
None
822. Two buses moving at 100 km/h and 80 km/h respectively cross each other while moving in opposite directions. Velocity of one bus relative to the other is:
100 km/h
20 km/h
80 km/h
180 km/h
823. An elastic collision is the one in which:
Kinetic energy and momentum is conserved
Kinetic energy is conserved but total energy is not conserved
Momentum is conserved but kinetic energy is not conserved
Both kinetic energy and momentum are not conserved
824. The explosion of explosive material is application of:
Newton's 1st law
Newton's 2nd law
Law of conservation of momentum
Law of gravitation
825. If two objects of equal masses "m" are moving towards each other with the same speed "v" then what will be the total final momentum after elastic head-on collision?
#NAME?
10 kg m/s
2mv kg's
0 kg m/s
826. A stone thrown horizontally from the top of a tall building follows a path that is:
Circular
Made of two straight line segments
Hyperbolic
Parabolic
827. If two equal masses are in motion with same individual speeds, we can conclude that:
Their momentum are same
Their momentum can be different
Their K.E are different
Their total energies are same
828. In an elastic collision the total kinetic energy:
Dissipates after collision
Increases after the collision
Reduces after the collision
Before and after collision remains the same
829. What is the time rate of change of linear momentum?
Acceleration
Force
Velocity
Work
830. At what pair of angles for a projectile the ranges are equal?
25°, 55°
60°, 30°
40°, 60°
25°, 55°
831. The angle of projection of a projectile for which its maximum height and horizontal range are equal is:
86°
46°
66°
76°
832. At highest point in a projectile motion, the velocity will be:
vx > 0, vy = 0
vx = -vy = constant
constant, vy = 0
vx = constant, vy = 0
833. Momentum is product of mass and velocity, then momentum and velocity are:
Parallel
Perpendicular
Antiparallel
Independent
834. Two bodies having the same mass undergo elastic collision then their velocities after collision will be:
v₁ = 0 = v₂
v₁ = –v₂
v₁ = v₁, v₂ = v₂
v₁ = v₂, v₂ = v₁
835. Momentum is product of mass and velocity then momentum and velocity are:
Parallel
Perpendicular
Antiparallel
Independent
836. In explosions:
Total K.E is conserved
Total P.E is conserved
Total momentum is conserved
Total momentum + K.E is conserved
837. A projectile is launched. Its velocity is maximum at:
Point of projection
Highest point
Between launching and highest point
All points
838. A projectile is thrown at an angle of 45° with horizontal and its range is R₁. Another projectile is thrown at an angle of 45° with vertical and its range is R₂. The relation between R₁ and R₂ is:
R₁ = 2R₂
R₁ = 2R₂
R₁ = R₂
3R₁ = R₂
839. A car in motion hits and gets crashed into a tree trunk, what is NOT conserved?
Kinetic energy alone
Momentum and kinetic energy both
Momentum alone
Neither kinetic energy nor momentum
840. The newton-second is unit of:
Work
Power
Impulse
Momentum
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