Physics Test

Question 1
4 / -1

The resistance of a copper wire is 19.5 ohm. Its length is 8 km and diameter is 3 mm. What is the specific resistance of copper?

A
1.35 x 10-8ohm metre

B
1.72 x 10-8ohm metre

C
4.05 x 10-6ohm metre

D
8.10 x 10-5ohm metre

Question 2
4 / -1

Directions:For the given statements of Assertion and Reason, mark the correct answer as:

(a) if both assertion and reason are true and reason is the correct explanation of assertion

(b) if both assertion and reason are true, but reason is not the correct explanation of assertion

(c) if assertion is true, but reason is false

(d) if both assertion and reason are false

Assertion:Reversible systems are difficult to find in real world.

Reason:Most processes are dissipative in nature.

A
A

B
B

C
C

D
D

Question 3
4 / -1

With the two forces acting at a point, the maximum effect is obtained when their resultant is 4N. If they act at right angles, then their resultant is 3N. Then the forces are

A
$(2+\sqrt{2}) \mathrm{N}$ and $(2-\sqrt{2}) \mathrm{N}$

B
$(2+\sqrt{3}) \mathrm{N}$ and $(2-\sqrt{3}) \mathrm{N}$

C
$\left(2+\frac{1}{2} \sqrt{2}\right) \mathrm{N}$ and $\left(2-\frac{1}{2} \sqrt{2}\right) \mathrm{N}$

D
$\left(2+\frac{1}{2} \sqrt{3}\right) \mathrm{N}$ and $\left(2-\frac{1}{2} \sqrt{3}\right) \mathrm{N}$

Question 4
4 / -1

The values of the horizontal component of Earth's magnetic field and angle of dip are 1.8 × 10−5Wb/m2and 30o, respectively, at some place. The total intensity of Earth's magnetic field at that place will b

A
3.18 × 10−3Wb/m2

B
3.67 × 10−5Wb/m2

C
5 × 10−3Wb/m2

D
2.08 × 10−5Wb/m2

Question 5
4 / -1

The equation of displacement of two waves are given as: $y 1=10 \sin \left(3 \pi t+\frac{\pi}{3}\right), y 2=5(\sin 3 \pi t+\sqrt{3} \cos 3 \pi t) .$ What is the ratio of their amplitudes?

A
1 : 2

B
2 : 1

C
1 : 1

D
None of these

Question 6
4 / -1

Four identical spheres, each of mass 1 kg and radius 10 cm, are placed on a horizontal surface touching one another such that their centres are located at the corners of a square of side 20 cm. What is the distance of the centre of mass from the centre of sphere?

A
5 cm

B
10 cm

C
15 cm

D
$10 \sqrt{2}$ cm

Question 7
4 / -1

The equation of a wave travelling on a string is $y=4 \sin \left\{\frac{\pi}{2}\left(8 t-\frac{x}{8}\right)\right\}$ where $x$ and $y$ are in $\mathrm{cm}$ and $t$ in seconds. The velocity of the wave is

A
64 cm/s in - x direction

B
32 cm/s in - x direction

C
32 cm/s in + x direction

D
64 cm/s in + x direction

Question 8
4 / -1

When a sound wave of frequency 300 Hz passes through a medium, the maximum displacement of a particle of the medium is 0.1 cm. The maximum velocity of the particle is equal to

A
10π cm/s

B
30π cm/s

C
30π cm/s

D
60π cm/s

Question 9
4 / -1

In a LR circuit of $3 \mathrm{mH}$ inductane and $4 \Omega$ resistance, $\operatorname{emf} \mathrm{E}=4 \cos (1000 \mathrm{t})$ volt is applied. The amplitude of current is:

A
0.8 A

B
(4/7) A

C
1.0 A

D
(4/√7)A

Question 10
4 / -1

If a body travels half the distance with velocity v1and the next half with velocity v2, then its average velocity will be given by

A
$v=\sqrt{v_{1}+v_{2}}$

B
$v=\frac{v_{1}+v_{2}}{2}$

C
$v=\frac{v_{1}}{v_{2}}$

D
$\frac{2 v_{1} v_{2}}{v_{1}+v_{2}}$

Submit Test

Physics Test - ...

Question 1

1.35 x 10-8ohm metre

1.72 x 10-8ohm metre

4.05 x 10-6ohm metre

8.10 x 10-5ohm metre

Question 2

A

B

C

D

Question 3

\((2+\sqrt{2}) \mathrm{N}\) and \((2-\sqrt{2}) \mathrm{N}\)

\((2+\sqrt{3}) \mathrm{N}\) and \((2-\sqrt{3}) \mathrm{N}\)

\(\left(2+\frac{1}{2} \sqrt{2}\right) \mathrm{N}\) and \(\left(2-\frac{1}{2} \sqrt{2}\right) \mathrm{N}\)

\(\left(2+\frac{1}{2} \sqrt{3}\right) \mathrm{N}\) and \(\left(2-\frac{1}{2} \sqrt{3}\right) \mathrm{N}\)

Question 4

3.18 × 10−3Wb/m2

3.67 × 10−5Wb/m2

5 × 10−3Wb/m2

2.08 × 10−5Wb/m2

Question 5

1 : 2

2 : 1

1 : 1

None of these

Question 6

5 cm

10 cm

15 cm

102cm

Question 7

64 cm/s in - x direction

32 cm/s in - x direction

32 cm/s in + x direction

64 cm/s in + x direction

Question 8

10π cm/s

30π cm/s

30π cm/s

60π cm/s

Question 9

0.8 A

(4/7) A

1.0 A

(4/√7)A

Question 10

\(v=\sqrt{v_{1}+v_{2}}\)

\(v=\frac{v_{1}+v_{2}}{2}\)

\(v=\frac{v_{1}}{v_{2}}\)

\(\frac{2 v_{1} v_{2}}{v_{1}+v_{2}}\)

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$10 \sqrt{2}$ cm