Download 1 - Physics World

1. The
^ ratio of time taken for half of the way to that of the whole journey by a free
falling
^
object in air is
A.
B.
C.
D.
E.
2:1
1:2
(2)1/2 : 2
(3)1/2 : 2
2 : (2)1/2
2. Which
^
of the following physical quantities is NOT a vector?
^
A. displacement
B. velocity
C. acceleration
D. work
E. force
3. Pressure
^
is measured in the unit
^
A. joule (J)
B. kg ms-2
C. N m-2
D. volt (V)
E. watt (W)
4. The
^ motion of an object is
recorded
^
by a ticker timer with
frequency 100 Hz. The tape
obtained is shown. Calculate its
acceleration.
A.
B.
C.
D.
E.
2 ms-2
4 ms-2
6 ms-2
8 ms-2
10 ms-2
5. An
^ object is thrown vertically upwards and returns to its starting point in a time t.
Which
^
of the following statements is/are correct ?
(1)
(2)
(3)
A.
B.
C.
D.
E.
The displacement of the object in time t is zero.
The object takes a time t/2 to reach the highest point.
The acceleration of the object is zero at the highest point.
(1) only
(3) only
(1) & (2) only
(2) & (3) only
(1), (2) & (3)
6. A
^ nucleus originally at rest split into two fragments of unequal mass. The
fragment
^
with larger mass has a smaller
(1) momentum
(2) speed
(3) kinetic energy
A.
B.
C.
D.
E.
(1) only
(3) only
(1) and (2) only
(2) and (3) only
(1), (2) and (3)
7. A
^ ball is projected from the ground vertically upwards at a velocity of 5 m s-1.
What
^
is the time elapsed before it returns to the ground?
A.
B.
C.
D.
E.
0.5 s
1.0 s
1.5 s
2.0 s
2.5 s
8. A
^ heavy box of 20 kg moves down
a^ slope with acceleration 4.5 m s-2 .
Find the friction acting on the
box.
A.
B.
C.
D.
E.
38.6 N
44.4 N
57.9 N
90.0 N
129.0 N
40
9. Two
^ metal spheres, X and Y, of mass m and 2m are projected vertically upward. If they
^ return to the ground at the same time, which of the following statements is/are
(1)
(2)
(3)
A.
B.
C.
D.
E.
correct?
They are projected with the same speed.
They are projected to the same maximum height.
The acceleration of Y is two times that of X.
1. Only
2. Only
1. and 2. Only
1. and 3. Only
2. and 3. Only
10. Two
^ balls of masses m and 2m
respectively,
^
roll down from
inclined planes as shown in
figure. Determine the ratio of
speed A to speed B as they reach
the bottom point.
A.
B.
C.
D.
E.
1:1
1: 2
1:2
1:4
1: 5