PART A -
PHYSICS
1. A body of mass m = 3.513 kg
.
Ans :
3
Sol: min
(4, 3)
=
3
2. Consider a uniform square plate of side
.
Ans :
Sol: I
= I
cm + md2
=
=
3. The speed of sound in oxygen
..
*Ans : 1419 m/s
Sol:
=
v
He
=
=
1419 m/s
* None of the given answers matches
with our answer.
4. A thin spherical shell of radius R has
..
Ans :
Sol: E = 0, r < R
E =
r > R
5. Relative permittivity and permeability of a
Ans : e
r
= 1.5, m
r =
0.5
Sol: m
r < 1 for diamagnetic
e
r > 1 for all materials
6. Suppose an
electron is attracted towards the
..
Ans : Tn independent of n, rn ΅
n
Sol:
ή
independent of n
mvr =
ή
r ΅
n
7. A block of
mass 0.50 kg is moving with a speed
Ans : 0.67 J
Sol:
=
8. A wave
traveling along the x-axis is
..
Ans : a
= 25.00
p
, b
= p
Sol: a
=
b
= w
=
ή
a
= 25.00
p
, b
= p
9. A working
transistor with its three legs
.
Ans : it
is npn transistor with R as base.
Sol: Emitter to collector will always be non conducting.
10. A jar is filled
with two non-mixing
.
Ans : r
1 < r
3 < r
2
Sol: r
3 floats in r
2 and sinks in r
1
=
r
1
< r
3
< r
2
11. An athlete in
the Olympic games
.
Ans : 2000
J 5000 J
Sol: v
is of the order of 10 ms-
1 and mass is around
50 kg ή
2000 J 5000 J
12. A parallel
plate capacitor with air between
Ans : 40.5
pF
Sol: C
1
= 9 ΄
3 ΄
3 = 81
C
2
=
C
=
= 40.5 pF
13. The dimension
of magnetic field in
.
Ans : MT-
1C-
1
Sol: F = Bqv
[B] =
= MT-
1C-
1
14. A body is at rest at x = 0. At t = 0
.
Ans :
Sol: x
1
-
x2 =
15. In the circuit below, A and B represent
..
Ans : OR
gate
Sol: Either
A or B is high, it pulls C high
ή
OR gate
16. While measuring the speed of sound
Ans : x
> 54
Sol: Speed
increases slightly with
temperature
ή
l
increases ή
for
second resonance x > 54
17. Shown in the figure below is a meter-bridge
..
Ans : 220
W
Sol:
R
= 220 W
18. A spherical solid ball of volume V is
.
Ans :
Sol: Kv
2 = mg -
FB
= (r
1-
r
2) Vg
v =
19. A thin rod of length L is lying along
Ans :
Sol: x
cm
=
=
<