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1
If the net external energy remains zero, then ____________________
The linear momentum of the system remains constant
The linear momentum of the system decreases
The linear momentum increases
None of the above
2
A metal ball with the momentum mv strikes a wall and bounces back. The change in the ball's momentum is ideally ________________
0
mv
2mv
-2mv
3
The normal forces in an inclined plane are always directed ___________________ to the surface that the object is on.
Opposite
Perpendicular
In same direction
None of these.
4
What is the motion of the rocket based on ?
Mass
Linear Momentum
Kinetic Energy
Angular momentum
5
In the absence of the friction and the other forces, the acceleration of an object is the value of the parallel component divided by the ________________.
Length
Quantity
6
The force that is directed to an angle to the horizontal is resolved into ____________________components.
Horizontal
Vertical
Both (a) and (b) are correct.
7
Working of Rocket is based on the principle of __________
Kelper's Law
Newton's Law
Conservation of linear momentum
Columb's Law
8
The S.I unit of impulse is ____________________ .
Ns
kg m
Both (A) and (B)
9
Rocket Engine lift rocket from the earth surface because the hot gas with high velocity
Push against the air
Push against the earth
Heats up the air which lifts the rocket
React against the rocket and push it up
10
Choose the correct relation.
All are correct
11
A hammer weighing 3 kg, moving with a velocity of 10 m/s, strikes against the head of a spike and drives it into a block of wood. If the hammer comes to rest in 0.025 s, the impulse associated with the ball will be ___________________________.
30 Ns
-30 Ns
15 Ns
-15 Ns
12
Under high impact force , materials break rather than deform because __________________.
Because material of the object is more strong
Because material is easily breakable
Because the time is not sufficient for these vibrations to occur
13
A hammer weighing 3 kg, moving with a velocity of 10 m/s, strikes against the head of a spike and drives it into a block of wood. If the hammer comes to rest in 0.025 s, the impulse associated with the ball will be __________________
30 N s
- 30 N s
15 N s
- 15 N s
14
A cylinder rolls up without slipping on an inclined plane and,after reaching a certain height, rolls down without slipping then,then the direction of the frictional forces on the cylinder acting parallel to the inclined plane are _________________________ .
upwards at the time of rolling up and downwards at the time of rolling down
upwards at the time of rolling up as well as at rolling down
downwards at rolling up and upwards at rolling down
downwards at rolling up as well as at rolling down
15
Due to an impulse, the change in momentum of a body is . If the duration of the impulse is 0.2 s, then what is the force produced in it ?
9 N
8 N
7 N
6 N