SAT Physics - Mechanics
Exam Duration: 45 Mins Total Questions : 30
In 10 minutes a car whose speed is 60 km/hr travels a distance of
- (a)
10 km
- (b)
20 km
- (c)
30 km
- (d)
45 km
When the distance an object travels indirectly proportional to the length of the time, it is said to travel with
- (a)
zero velocity
- (b)
uniform velocity
- (c)
constant speed
- (d)
constant acceleration
The acceleration of a moving body can be found from
- (a)
area under velocity - time graph
- (b)
area under distance = time graph
- (c)
slope of the velocity - time graph
- (d)
slope of the velocity - time graph
A stone is released with zero velocity from the top of a tower and travels 24.5 m in last seconds of its journey. The time for which the stone is in air is
- (a)
3 sec
- (b)
9 sec
- (c)
1 sec
- (d)
5 sec
A particle revolves around a circular path the acceleration of the particle is
- (a)
along the circumference of the circle
- (b)
along the tangent
- (c)
along the radius
- (d)
zero
The SI unit of force is
- (a)
Newton
- (b)
joule
- (c)
dyne
- (d)
kgwt
The force required to produce an acceleration of 5 m/S2 in an object of mass 2 kg is
- (a)
2.5 N
- (b)
10.0 N
- (c)
0.4 N
- (d)
7.0 N
Force can be defined on the basis of
- (a)
Newton's first law of motion
- (b)
Newton's second law of motion
- (c)
Newton's third law of motion
- (d)
Newton's law of gravitation
Momentum has the same units as that of
- (a)
couple
- (b)
torque
- (c)
impulse
- (d)
moment of momentum
The action and reaction forces referred to Newton's third law
- (a)
must act on the same object
- (b)
may act on different objects
- (c)
must act on different objects
- (d)
need not be equal in magnitude but must have the same direction.
Maximum value of static friction is called
- (a)
limiting friction
- (b)
rolling friction
- (c)
normal reaction
- (d)
coefficient of friction
A man is at rest in the middle of a pond on perfectly smooth ice. He can get himself to the shore by making use of Newton's
- (a)
first law
- (b)
second law
- (c)
third law
- (d)
all the laws
A car is moving with a speed of 30 m/ s on a circular path of radius 500 m. Its speed is increasing at the rate f 2 m/s2. What is the acceleration of the car.
- (a)
9.8 m/s2
- (b)
2.7 m/s2
- (c)
2 m/s2
- (d)
1.8 m/s2
Which of the following is not a vector quantity?
- (a)
acceleration
- (b)
momentum
- (c)
weight
- (d)
pressure
The unit of impulse is
- (a)
Nm
- (b)
Ns
- (c)
Nms-1
- (d)
Ns-1
A body is thrown vertically upwards with velocity V. It returns to earth after reaching a height H. What is the ratio of displacement to distance covered by the body?
- (a)
2H
- (b)
H
- (c)
zero
- (d)
infinite
In an inclined plane we lose in terms of distance but gain in
- (a)
energy
- (b)
work
- (c)
efficiency
- (d)
force
A ball is dropped from rest from a height of 12m. If the ball loses 25% of its K.E. on striking the ground, what is the height to which it bounces?
- (a)
6 m
- (b)
9 m
- (c)
12 m
- (d)
16 m
What will happen if a steam of air is being blown horizontally through a tube under one of the pans of a physical balance in equilibrium?
- (a)
the pan will go up
- (b)
the pan will go down
- (c)
the pan will remain unaffected
- (d)
the pan will first go up then down
A lift is accelerating upwards at 2 m/s2 and a man inside has a mass of 60 kg. Assuming g = 10 N/kg, the reaction on the man at the floor is
- (a)
120 N
- (b)
600 N
- (c)
700 N
- (d)
720 N
The area under acceleration - time graph represents
- (a)
displacement
- (b)
velocity
- (c)
change in velocity
- (d)
distance travelled
What is the maximum height attained by a body which is thrown upwards with an initial velocity 'u'?
- (a)
ug
- (b)
u/2g
- (c)
u2/2g
- (d)
2u2
The linear momentum of a body is increased by 20%. The percentage increase in the kinetic energy will be
- (a)
20%
- (b)
40%
- (c)
44%
- (d)
50%
The velocity-time graph of a particular of a particles is not a straight line. Its acceleration is
- (a)
zero
- (b)
constant
- (c)
negative
- (d)
variable
If a constant force acts on a body initially kept at rest, the distance moved by the body in time t is proportional to
- (a)
t
- (b)
t2
- (c)
t3
- (d)
t4
A body floats in a liquid if the buoyant force is
- (a)
zero
- (b)
greater than its weight
- (c)
less than its weight
- (d)
equal to its weight
Newton's law of gravitation is valid
- (a)
on the earth only
- (b)
everywhere
- (c)
on the moon only
- (d)
in the laboratory only
The acceleration due to gravity is 9.8 m/s2
- (a)
much above the earth's surface
- (b)
near the earth's surface
- (c)
deep inside the earth
- (d)
at the centre of the earth
A body of mass 2 Rg is dropped from height of 1 m. Its kinetic energy as it reaches the ground is
- (a)
19.6 J
- (b)
19.6 N
- (c)
19.6 kg
- (d)
19.6 m
When the speed of particle is doubled, the ratio of its kinetic energy to its momentum
- (a)
remains the same
- (b)
gets doubled
- (c)
becomes half
- (d)
becomes 4 times
