AMU 1995; MH CET (Med.) 1999, 2001; Kerala PET 2007; MP PET 2013
Q326
Errorless
Kinetic Friction
MCQ
The maximum speed of a car on a road turn of radius 30m; if the coefficient of friction between the tyres and the road is 0.4; will be
A.
9.84 m/s
B.
10.84 m/s
C.
7.84 m/s
D.
5.84 m/s
SCRA 1994
Q327
Errorless
Self Evaluation Test
MCQ
A person is sitting in a travelling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is
A.
Moving forward and gaining speed
B.
Moving forward and losing speed
C.
Moving forward with uniform speed
D.
Moving backward with uniform speed
Q328
Allen
Conceptual Questions
MCQ
A particle is in a straight line motion with uniform velocity. A force is not required :-
A.
To increase the speed
B.
To decrease the speed
C.
To maintain the same speed
D.
To change the direction
Q329
Allen
Conceptual Questions
MCQ
Essential characteristic of equilibrium is :-
A.
Momentum equals zero
B.
Acceleration equals zero
C.
K.E. equals zero
D.
Velocity equals zero
Q330
Allen
Conceptual Questions
MCQ
When a constant force is applied to a body, it moves with uniform :-
A.
Acceleration
B.
Velocity
C.
Speed
D.
Momentum
Q331
Allen
Conceptual Questions
MCQ
A 10 kg mass is accelerated from rest to 30 m/s in 2 s. What force acts on it: -
A.
300 N
B.
150 N
C.
75 N
D.
600 N
Q332
Allen
Conceptual Questions
MCQ
A body of mass 80 g is moving with a constant velocity of 4 cm/s on a horizontal frictionless table. The force on the body (in dynes) is :-
A.
Zero
B.
39200
C.
78400
D.
8000
Q333
Allen
Conceptual Questions
MCQ
A body of mass 6 kg moving on a horizontal surface with an initial velocity of 8 m/s comes to rest after 3 s. If one wants to keep this body moving on the same surface with a velocity of 8 m/s, the force required is :-
A.
8 N
B.
16 N
C.
Zero
D.
6 N
Q334
Allen
Conceptual Questions
MCQ
An object with a mass 5 kg moves at a constant velocity of 8 m/s. A constant force then acts for 6 seconds on the object giving it a speed of 4 m/s in opposite direction. The acceleration produced is :-
A.
$1.5 \mathrm{~m} / \mathrm{s}^{2}$
B.
$-2 \mathrm{~m} / \mathrm{s}^{2}$
C.
$0.67 \mathrm{~m} / \mathrm{s}^{2}$
D.
$-0.5 \mathrm{~m} / \mathrm{s}^{2}$
Q335
Allen
Conceptual Questions
MCQ
The velocity acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to :-
A.
$\sqrt{\mathrm{m}}$
B.
$\mathrm{m}^0$
C.
$\frac{1}{\sqrt{\mathrm{m}}}$
D.
m
Q336
Allen
Conceptual Questions
MCQ
A ship of mass $5 \times 10^{7}$ kg initially at rest is pulled by a force of $25 \times 10^{4}$ N through a distance of 100m. Neglecting friction, the speed of the ship at this moment is:
A.
3.0 m/s
B.
1.5 m/s
C.
1 m/s
D.
2 m/s
Q337
Allen
Conceptual Questions
MCQ
A body of mass 40 gm is moving with a constant velocity of 2cm/sec on a horizontal frictionless table. The force on the table by the body is :-
A.
39200 dyne
B.
160 dyne
C.
80 dyne
D.
zero
Q338
Allen
Conceptual Questions
MCQ
Three forces start acting simultaneously on a particle moving with velocity $\vec{V}$ . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity
A.
less than $\vec{v}$
B.
greater than $\vec{v}$
C.
$\vec{v}$ , in the direction of largest force BC
D.
$\vec{v}$ remains unchanged
Q339
Allen
Conceptual Questions
MCQ
A body with mass 5 kg is acted upon by a force $\vec{\mathrm{F}} = (-3\hat{\mathrm{i}} + 4\hat{\mathrm{j}})\mathrm{N}$ . If its initial velocity at $t = 0$ is $\vec{\mathrm{u}} = (6\hat{\mathrm{i}} - 12\hat{\mathrm{j}})\mathrm{ms}^{-1}$ , the time at which it will just have a velocity along the Y-axis is:-
A.
never
B.
10 s
C.
2 s
D.
15 s
Q340
Allen
Conceptual Questions
MCQ
When forces $F_{1}$ , $F_{2}$ , $F_{3}$ are acting on a particle of mass m such that $F_{2}$ and $F_{3}$ are mutually perpendicular then the particle remains stationary. If the force $F_{1}$ is now removed then the acceleration of the particle is:
A.
$F_{1}/m$
B.
$F_{2}F_{3}/mF_{1}$
C.
$(F_{2}-F_{3})/m$
D.
$F_{2}/m$
Q341
Allen
Conceptual Questions
MCQ
A stone of mass 1 kg is lying on the floor of a train which is accelerating with $1 \, ms^{-2}$ . The net force acting on the stone is :-
A.
zero
B.
1 N
C.
5 N
D.
10 N
Q342
Allen
Conceptual Questions
MCQ
A car accelerates on a horizontal road due to the force exerted by :-
A.
the engine of the car
B.
the driver of the car
C.
the car on earth
D.
the road on the car
Q343
Allen
MOMENTUM RELATED PROBLEMS
MCQ
Newton's II law of motion connects :
A.
Momentum and acceleration
B.
Change of momentum and velocity
C.
Rate of change of momentum and external force
D.
Rate of change of force and momentum
Q344
Allen
MOMENTUM RELATED PROBLEMS
MCQ
When we kick a stone, we get hurt. Due to which of the following properties of stone does it happens?
A.
Inertia
B.
Velocity
C.
Reaction
D.
Momentum
Q345
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A force of 20 N acts on a body of mass 10 kg for 20 seconds. The change in its momentum is
A.
40 kg-m/s
B.
100 kg-m/s
C.
400 kg-m/s
D.
200 kg-m/s
Q346
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A player catches a ball of 100 g moving with a speed of 5 m/s. If the time taken to complete the catch is 0.25 s, the force exerted on the player's hand is :-
A.
8 N
B.
4 N
C.
2 N
D.
0 N
Q347
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A football of mass 0.5 kg coming towards player with a velocity of 10 m/s. Player hit straight back the football with velocity 15 m/s. If the contact time is 0.02 second then the average force involved is:-
A.
250 N
B.
1250 N
C.
500 N
D.
625 N
Q348
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A 100 g tennis ball coming at a speed of 20 m/s is hit straight back by a bat to speed of 40 m/s. The magnitude of the average force F on the ball, when it is in contact for 5 ms with the bat is:-
A.
1200 N
B.
6000 N
C.
2400 N
D.
1000 N
Q349
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A ball weighing 50 g hits a hard surface vertically with a speed of 25 m/s and rebounds with the same speed. The ball remains in contact with the surface for 0.05 s. The average force exerted by the surface on the ball is:
A.
100 N
B.
25 N
C.
50 N
D.
5 N
Q350
Allen
MOMENTUM RELATED PROBLEMS
MCQ
A tennis ball is dropped on the floor from a height of 10 m. It rebounds to a height of 5 m. The ball was in contact with the floor for 0.01 s. What was its average acceleration during the contact? (g=10m/s²)
A.
800 m/s²
B.
200 m/s²
C.
1600 m/s²
D.
2400 m/s²