GENERAL SCIENCE #30
MULTIPLE CHOICE QUESTIONS
1. A
particle is moving in a circular path of radius r. The displacement after half
a circle would be ……………
(a) Zero
(b) πr
(c) 2r
(d) 2Ï€r
Answer:
(c)
2. A
body is thrown vertically upward with velocity u, the greatest height h to
which it will rise is ……………
(a) ulg
(b) u2l2g
(c) u2lg
(d) ul2g
Answer:
(b)
3. What
is the numerical ratio of displacement to distance for a moving object?
(a) Always less than 1
(b) Always equal to 1
(c) Always more than 1
(d) Equal or less than 1
Answer:
(d)
4. If
the displacement of an object is proportional to square of time, then the
object moves with ……………
(a) uniform velocity
(b) uniform acceleration
(c) increasing acceleration
(d) decreasing acceleration
Answer:
(b)
5. 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
Answer:
(c)
6. Area
under a Ï… -1 graph represents a physical quantity which has the unit …………..
(a) m2
(b) m
(c) m3
(d) ms-1
Answer:
(b)
7. Slope
of a velocity-time graph gives ……………
(a) the distance
(b) the displacement
(c) the acceleration
(d) the speed
Answer:
(c)
8. In
which of the following cases of motions, the distance moved and the magnitude
of displacement are equal?
(a) If the car is moving on a straight road
(b) If the car is moving in Circular path
(c) The pendulum is moving to and fro
(d) The earth is revolving around the sun
Answer:
(a)
9. A
boy goes from A to B with a velocity of 20 m/min and comes back from B to A
with a velocity of 30 m/min. The average velocity of the boy during the whole
journey is ……………
(a) 24 m/min
(b) 25 m/s
(c) Zero
(d) 20 m/min
Answer:
(a)
10. A
body is projected vertically upward from the ground. Taking vertical upward
direction as positive and point of projection as origin, the sign of
displacement of the body from the origin when it is at height h during upward
and downward journey will be ...............
(a) Positive, positive
(b) Positive, negative
(c) Negative, negative
(d) Negative, positive
Answer:
(a)
11. What
is the ratio of speed to the magnitude of velocity when the body is moving in
one direction?
(a) Less than one
(b) Greater than one
(c) Equal to one
(d) Greater than or equal to one
Answer:
(c)
12. Which
of the following situations is possible?
(a) An object can have acceleration, but constant
velocity.
(b) The velocity of an object may be zero but
acceleration is not zero.
(c) Distance and the magnitude of displacement are equal
in circular motion.
(d) Average speed and the magnitude of average velocity
are always equal in circular motion.
Answer:
(b)
13. What
is called the total path length travelled by a body in a given interval of
time?
(a) Speed
(b) Distance
(c) Kilometre
(d) Minute
Answer:
(b)
14. What
will be the retardation when a car driver travelling at a speed of 10 m/s
applies brakes and brings the car to rest in 20 s?
(a) + 2 m/s2
(b) − 2 m/s2
(c) − 0.5 m/s2
(d) + 0.5 m/s2
Answer:
(d)
15. A
car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time
graph for this car is a horizontal line parallel to the time axis, then what
will be the velocity of the car at the end of 25 s?
(a) 40 m/s
(b) 25 m/s
(c) 10 m/s
(d) 250 m/s
Answer:
(c)
16. Which
of the following is most likely not a case of uniform circular motion?
(a) Motion of the earth around the sun
(b) Motion of a toy train on a circular track
(c) Motion of a racing car on a circular track
(d) Motion of hours’ hand on the dial of a clock
Answer:
(c)
17. A
car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a
uniform acceleration of – 0.5 m/s2. Find how far the car will go
before it is brought to rest?
(a) 8100 m
(b) 900 m
(c) 625 m
(d) 620 m
Answer:
(c)
18. In
accelerated motion, the path of the moving particle is ……………
(a) straight line
(b) circular
(c) parabola
(d) All of the above
Answer:
(d)
19. If
a particular is at rest, then its displacement-time graph will be ……………
(a) a curve
(b) an inclined line
(c) a line parallel to time axis
(d) a line parallel time axis to displacement axis
Answer:
(c)
20. Which
of the following does not represent accelerated motion?
(a) A car changing its speed per second by 2 km/hr
(b) A man walking slowly with speed of 2 km/hr in a
straight line
(c) a car is moving on a circular track with uniform
speed of 20 km/hr
(d) Both ‘b’ and ‘c'
Answer:
(b)
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