

NTSE SAT Physics - Motion
Exam Duration: 45 Mins Total Questions : 30
A ball is released freely from the top of a building of height h. How long will it take for the ball to come down if h=80 m, g= 10 m/s2
- (a)
6 s
- (b)
8 s
- (c)
4 s
- (d)
2 s
Odometer of automobiles records
- (a)
average speed
- (b)
Distance travelled
- (c)
instantaneous speed
- (d)
average acceleration
The ratio of SI units to CGS units of velocity is
- (a)
10-2
- (b)
102
- (c)
10
- (d)
10-1
The distance (s) in metres travelled by a particle is related to time (t) in seconds by the equation of motion: S = 10t + 4t2.What is the initial velocity of the body
- (a)
10 m/s
- (b)
6 m/s
- (c)
4 m/s
- (d)
10 m/s2
A body moving along a straight line at 20 m/s decelerates at the rate of 4 m/s2. After 2 seconds its speed will be equal to:
- (a)
8 m/s
- (b)
12 m/s
- (c)
16 m/s
- (d)
-12 m/s
Speed of 90 km/h when expressed in m/s is:
- (a)
2.5
- (b)
25
- (c)
250
- (d)
90000
When a graph of one quantity versus another results in a straight line, the quantities are
- (a)
Directly proportional
- (b)
Constant
- (c)
Inversely proportional
- (d)
Independent of each other
The physical quantity describing motion and whose measure is the product of distance travelled and the time taken to travel that distance is _____
- (a)
Speed
- (b)
Mass
- (c)
Weight
- (d)
Displacement
Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms-1. It implies that the boy is
- (a)
at rest
- (b)
moving with no acceleration
- (c)
in accelerated motion
- (d)
moving with uniform velocity
A displacement:
- (a)
is always positive
- (b)
is always negative
- (c)
may be positive as well as negative
- (d)
is neither positive nor negative
Time is an example of:
- (a)
Scalar
- (b)
Vector
- (c)
Scalar or vector
- (d)
Neither scalar nor vector
Unit of velocity is:
- (a)
ms
- (b)
ms-1
- (c)
ms2
- (d)
none of these
Out of energy and acceleration which is vector?
- (a)
Acceleration
- (b)
Energy
- (c)
Both
- (d)
None of these
A car increase its speed from 20 kmh-1 to 50 kmh-1 is 10 sec, its acceleration is:
- (a)
30 ms-1
- (b)
3 ms-1
- (c)
18 ms-1
- (d)
0.83 ms-1
A body starts falling from height 'h' and travels distance hl2 during the last second of motion. The find of travel (in sec.) is:
- (a)
√2-1
- (b)
2+√2
- (c)
√2+√3
- (d)
√3+2
A car travels \(\frac{1}{3}\)rd distance on a straight road with a velocity of 10 km/hr, next \(\frac{1}{3}\)rd with velocity 20 km/hr and the last \(\frac{1}{3}\)rd with velocity 60 km/hr. What is the average velocity of the car in the whole journey?
- (a)
4 km/hr
- (b)
6 km/hr
- (c)
12 km/hr
- (d)
18 km/hr
The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocity at 3 seconds before is
- (a)
8 m/sec
- (b)
4 m/sec
- (c)
6 m/sec
- (d)
7 m/sec
A body covers 200 em in the first 2 sec and 220 cm in next 4 sec. What is the velocity of the body at the end of 7th second?
- (a)
40 cm/sec
- (b)
20 cm/sec
- (c)
10 cm/sec
- (d)
5 cm/sec
A ball is dropped on the floor from a height of 10 m. It rebounds to a height of2.5 m. If the ball is in contact with the floor for 0.0 1 sec, then average acceleration during contact is:
- (a)
2100 m/s2
- (b)
1400 m/s2
- (c)
700 m/s2
- (d)
400 m/s2
The relationship between average speed, time and distance is
- (a)
Average speed = distance time
- (b)
Average speed =\(\frac{total\quad distance}{total\quad time}\)
- (c)
Time = average speed/distance
- (d)
Distance = average speed time
Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
- (a)
Its speed keeps changing
- (b)
Its velocity always changes
- (c)
It always goes away from the earth
- (d)
A force is always acting on it
When a running must be accelerates suddenly, the pillion rider has a tendency to fall fbackward. This is an example 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 of motion
A force F acts on a stationary body for the time 1. The distance covered by the body 'S' will be proportional to
- (a)
t
- (b)
\(\frac { I }{ t } \)
- (c)
t2
- (d)
\(\frac { 1 }{ { t }^{ 2 } } \)
A body P has mass 2 m and velocity 5v. Another body Q has mass 8 m and velocity 1.25 v. The ratio of momentum of P and Q is:
- (a)
2:1
- (b)
1:1
- (c)
1:2
- (d)
3:2
Two stones, A and B are thrown from the top of a tower. The stone A is thrown vertically upwards while the stone E is thrown vertically downwards with the same speed. Which of the following statements is true
- (a)
B reaches the ground earlier than A
- (b)
A reaches the ground earlier than B
- (c)
A and B reach the ground together
- (d)
None of these
A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance S1 in the first 10 second and a distance S2 in the next 10 second, then
- (a)
S2 = 2S1
- (b)
S2=3S1
- (c)
S2=4S1
- (d)
S2=5S1
A constant force acts perpendicular to the velocity of a particle, then
- (a)
acceleration is constant
- (b)
velocity is constant
- (c)
momentum will be constant
- (d)
kinetic energy is constant
In one second a particle goes from point A to point B is moving in a semicircle of radius 10m as shown in the figure. The magnitude of average velocity is
- (a)
3.14 m/s
- (b)
zero
- (c)
2m/s
- (d)
none
A boat can have a speed of 2km/hr in still water the minimum time taken by the boat to cross a river of width 0.5 km flowing with a speed of 40 km/hr is
- (a)
15 min
- (b)
20 min
- (c)
3.75 min
- (d)
none
A stone is dropped into a lake from a tower 500 m high. The sound of the splash will be heard by a man on the tower after
- (a)
21 s
- (b)
10 s
- (c)
11.5 s
- (d)
14 s