Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Statement A: Rocket contains fuel as well as oxygen to burn its fuel in its body.
Statement B: A jet plane takes oxygen from atmosphere to burn its fuel

A
statement A is true

B
statement B is false

C
both the statement a and b are true

D
neither statement A nor statement B is true

Solution

Rocket contains fuel as well as oxygen to burn its fuel as combustion takes place only in presence of oxygen. A jet plane is filled with hydrogen only and it takes oxygen from atmosphere to burn its fuel. So, both statements are true.
Question 2
1 / -0

“Inflated balloon lying on the surface of a floor moves forward when pierced with a pin.
The above mentioned phenomena is due to

A
Conservation of energy

B
Newton’s third law of notion

C
Newton’s second law of motion

D
Newton’s fist law of motion

Solution

Inflated balloon lying on the surface of a floor moves forward when pierced with a pin due to Newton’s third law of motion. The air coming out of the balloon forces the balloon in opposite direction.
Question 3
1 / -0

The change in the momentum of a body in 0.01 second is 10 kg ms-1. The force acting on this body is

A
1000N

B
100N

C
0.1N

D
10N

Solution

The force acting on a body is equal to rate of change of momentum. Change of momentum = 10 Kg/s, time taken = 0.01 second. Force = 10/0.01 = 1000N.
Question 4
1 / -0

Statement A: Rocket can propel its self in vacuum.
Statement B: Newton’s laws are universal.
Which of the two statements is true?

A
statement A

B
statement B

C
both A and B

D
none of these

Solution

Rocket moves forward according to newton’s third law of motion. The gas and other substance coming out from the tail push the rocket in forward direction. Newton’s laws are universal.
Question 5
1 / -0

A ball is dropped from a height of 10m. Ball is embedded in sand of 1m and stops.

A
neither K.E nor momentum is conserved.

B
only momentum remains conserved

C
only kinetic energy remains conserved

D
both momentum and kinetic energy are conserved

Solution

When body is dropped from height, the potential energy deceases and kinetic energy increases. After being fallen on the sand potential energy becomes zero and kinetic energy becomes maximum. Thus, a ball dropped from height will conserve only kinetic energy.
Question 6
1 / -0

Two bodies of masses 1kg and 5kg are dropped gently from the top of a tower. At a point 50cm from the ground both the bodies will have the same

A
kinetic energy

B
momentum

C
total energy

D
velocity

Solution

The velocity of the body falling towards depends upon gravitational force acting on it. So, both the body of masses 1 kg and 5 kg will have same velocity at particular height and fall at same time at the ground.
Question 7
1 / -0

Statement A: Calculus, a new branch of mathematics was stated by Newton.
Statement B: If mass remains same, doubling the force will reduce the acceleration to half.
Which of the above two statements is true

A
statement A

B
statement B

C
both a and b

D
none of these

Solution

The branch of mathematics, called Calculus was stated by Newton. Force is the product of mass and acceleration. So, acceleration= force /mass. Doubling of force will double the acceleration if mass is kept same.
Question 8
1 / -0

If an object experiences a net zero unbalanced force, than the body

A
can be accelerated

B
cannot remain at rest

C
moves with constant velocity

D
none of these

Solution

If an object experience a net zero unbalanced force, than the body moves with constant velocity. Zero unbalanced forces produce no acceleration in the body and the body continues to move with same velocity.
Question 9
1 / -0

Statement A: A passenger falls forward when a bus suddenly starts moving in the forward direction
Statement B: A gun recoils backward with small speed than the bullet moving forward.

A
statement A is true

B
statement B is true

C
both the statement A and B are true

D
neither statement A nor Statement B is true

Solution

A passenger falls backward when a bus suddenly start moving in the forward direction due to inertia of rest. A gun recoils backward with small speed than the bullet moving forward due to law of conservation of momentum.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 9

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Forces and Laws of Motion Test - 9

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Question 1

statement A is true

statement B is false

both the statement a and b are true

neither statement A nor statement B is true

Solution

Question 2

Conservation of energy

Newton’s third law of notion

Newton’s second law of motion

Newton’s fist law of motion

Solution

Question 3

1000N

100N

0.1N

10N

Solution

Question 4

statement A

statement B

both A and B

none of these

Solution

Question 5

neither K.E nor momentum is conserved.

only momentum remains conserved

only kinetic energy remains conserved

both momentum and kinetic energy are conserved

Solution

Question 6

kinetic energy

momentum

total energy

velocity

Solution

Question 7

statement A

statement B

both a and b

none of these

Solution

Question 8

can be accelerated

cannot remain at rest

moves with constant velocity

none of these

Solution

Question 9

statement A is true

statement B is true

both the statement A and B are true

neither statement A nor Statement B is true

Solution

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