Scholarship Test Worksheet With Answer Key - Target Pmt Page 2
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8PHYSICS
Choose the correct (P) answer:
1.
A physical quantity Q is calculated according to the
7.
When a planet moves around sun, is :
expression
(1) A real velocity is constant
A B
3 3
Q
=
(2) Linear velocity is constant
C D
If percentage errors in A, B, C, D are 2%, 1%, 3% and 4%
(3) Angular velocity is constant
respectively, what is the percentage error in Q ?
(4) All the velocities are constant
(1)
(2)
±
8%
±
10%
8.
The ratio of the radii of gyration of a circular disc and a
(3)
(4)
±
12%
±
14%
circular ring of the same radius about a tangential axis in the
plane is
2.
Which of the following expression is meaningless :
r
r
r
r
r
r
r
( )
( ) ( )
(1)
(2)
a b
´
´
c
a b
×
´
c d
×
3
:
4
6
:
5
(1)
(2)
r
r
r r
r
r
r
(3)
(4)
(
) (
)
( )
5
:
6
4
:
3
g
( )
a b
´
c d
´
a
´
b d
´
(3)
(4)
9.
A particle is moving in a circular orbit with constant speed.
–2
3.
The acceleration a (in ms
) of a body, starting from rest
Select wrong alternate :
varies with time t (in s) according to the relation a = 3t+4.
(1) Its momentum is conserved
The velocity of the body at time t = 2s will be :
–1
–1
(1) 10ms
(2) 12ms
(2) Its angular momentum is conserved
(3) 14ms
–1
(4) 16ms
–1
(3) It is moving with variable velocity
4.
The ratio of the speed of a projectile at the point of projection
(4) It is moving with variable acceleration
to the speed at the top of its trajectory is x. The angle of
10. Two bodies of masses m and M are placed a distance d
projection with the horizontal is :
apart. The gravitational potential at the position where the
–1
–1
(1) sin
x
(2) cos
x
gravitational field due to them is zero is V,
1
1
æ ö
æ ö
sin
cos
-
1
-
1
G
(3)
(4)
ç ÷
ç ÷
Gm
(
)
x
x
V
= -
m M
+
è ø
è ø
(1)
(2)
V
= -
d
d
3
y 12x
=
-
x
2
5.
The equation of motion of a projectile is
.
G
2
GM
(
)
4
V
= -
m
+
M
(3)
V
= -
(4)
d
d
–2
Given that g = 10 ms
, what is the range of the projectile?
(1) 12m
(2) 16m
11. The 3rd of overtone of a closed organ pipe is equal to the
2nd harmonic of an open organ pipe. Then the ratio of their
(3) 20m
(4) 24m
lengths is equal to
6.
In the arrangement shown in the figure, the pulley has a
mass 3m. Neglecting friction on the contact surface, the
3
7
force exerted by the supporting rope AB on the ceiling is
(1)
(2)
5
4
7
3
(3)
(4)
6
2
12. A wall has two layers A and B each made of different
materials. The layer A is 10 cm thick and B is 20cm thick. The
thermal conductivity of A of thrice that of B. Under thermal
m
equilibrium temperature difference across the wall is 35°C.
2m
The difference of temperature across of the layer A is :
(1) 30°C
(2) 14°C
(1) 6mg
(2) 3mg
(3) 8.75°C
(4) 5°C
(3) 4mg
(4) None of these
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