Laws of Motion Test

Result

Laws of Motion Test - 53

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Weekly Quiz Competition

Question 1
4 / -1

A body floats in a liquid contained in a beaker. If the whole system as shown in figure falls freely under gravity, then the upthrust on the body due to liquid is

A
Zero

B
Equal to the weight of liquid displaced

C
Equal to the weight of the body in air

D
None of the above
Question 2
4 / -1

A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly?

A
1.5 kg

B
2.5 kg

C
3 kg

D
4 kg
Question 3
4 / -1

A man is standing on a balance and his weight is measured. If he takes a step in the left side, thenweight

A
Will decrease

B
Will increase

C
Remains same

D
First decreases then increases
Question 4
4 / -1

A cold soft drink is kept on the balance. When the cap is open, then the weight

A
Increases

B
Decreases

C
First increases then decreases

D
Remains same
Question 5
4 / -1

A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of 25 N. The bird (mass m = 0.5 kg) flies upward in the cage with an acceleration of 2 m/s². The spring balance will nowrecord a weight of

A
24 N

B
25 N

C
26 N

D
27 N

Solution
Question 6
4 / -1

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about thescale reading is

A
Both the scales read M/2 kg each

B
Both the scales read M kg each

C
The scale of the lower one reads M kg and of the upper one zero

D
The reading of the two scales can be anything but the sum of the reading will be M kg
Question 7
4 / -1

The tension in the spring is

A
Zero

B
2.5 N

C
5 N

D
10 N
Question 8
4 / -1

Rocket propulsion is associated with

A
The conservation of angular momentum

B
The conservation of mass

C
The conservation of mechanical energy

D
Newton's third law of motion
Question 9
4 / -1

A shell at rest at the origin explodes into three fragments of masses 1 kg, 2 kg and m kg. The 1 kg and 2 kg pieces fly off with speeds of 5 ms^–1 along x–axisand 6 ms^–1 along y-axis respectively. If the m kg piece flies off with a speed of 6.5 ms^–1, the total mass of theshell must be

A
4 kg

B
5 kg

C
3.5 kg

D
4.5 kg

Solution
Question 10
4 / -1

The rate of mass of the gas emitted from rear of a rocket is initially 0.1 kg/s. If the speed of the gas relative to the rocket is 50 m/s and mass of the rocket 2 kg then the acceleration of the rocket in m/s² is

A
5

B
5.2

C
2.5

D
25

Solution