Physics Test

Question 1
4 / -1

Using mass (M), length (L), time (T) and electric current (A) as fundamental quantities, the dimensions of permittivity will be

A
MLT-1A-1

B
MLT-2A-2

C
M-1L-3T4A2

D
M2L-2T-2A2

Question 2
4 / -1

A heater wire consumes power `P` when connected to a 220V source. If the wire is cut into four equal pieces, which are now connected in parallel, find the power consumed by the combination, if connected to the same power supply.

A
4P

B
P/4

C
16P

D
P/16

Question 3
4 / -1

The apparent depth of water in cylindrical water tank of diameter '2R' cm is reducing at the rate of 'x' cm/min when water is being drained out at a constant rate. The amount of water drained in cc per minute is _____. (n1= refractive index of air and n2= refractive index of water)

A
\(\frac{x \pi R^{2} n_{1}}{n_{2}}\)

B
\(\frac{x \pi R^{2} n_{2}}{n_{1}}\)

C
\(\frac{2 \pi R^{2} n_{1}}{n_{2}}\)

D
πR2x

Question 4
4 / -1

Directions: In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Mark the correct answer as:

(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

(b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

(c) If Assertion is true, but Reason is false.

(d) If both Assertion and Reason are false.

Assertion : Neutrons penetrate a matter more readily as compared to protons.

Reason : Neutrons are slightly more massive than protons.

A
A

B
B

C
C

D
D

Question 5
4 / -1

Consider the followingtwo statements A and B and identify the correct answer.

A:Constantan-Copper thermo-couple is generally used to measure temperature upto 1600oC.

B:In an iron-copper thermocouple, current flows from iron to copper through cold junction.

A
Both A and B are true.

B
Both A and B are false.

C
A is true but B is false.

D
A is false but B is true.

Question 6
4 / -1

A can is taken out from a refrigerator at \(0^{\circ} \mathrm{C}\). The atmospheric temperature is \(25^{\circ} \mathrm{C}\). If \(t_{1}\) is the time taken to heat from \(0^{\circ} \mathrm{C}\) to \(5^{\circ}\) and \(t_{2}\) is the time taken from \(10^{\circ} \mathrm{C}\) to \(15^{\circ} \mathrm{C},\) then

A
t1> t2

B
t1< t

C
t₁ = t₂

D
there is no relation

Question 7
4 / -1

A beam of protons with velocity 4 x 10⁵ m/s enters a uniform magnetic field of 0.3 T at an angle of 60o to the magnetic field. Find the radius of the helical path taken by the proton beam.

A
0.2 cm

B
1.2 cm

C
2.2 cm

D
0.122 cm

Question 8
4 / -1

If power dissipated by 5Ω resistor is 20 W, then find the power dissipated by 4Ω resistor.

A
10 W

B
20 W

C
4 W

D
15 W

Question 9
4 / -1

The resultant of forces \(\overrightarrow{\mathrm{P}}\) and \(\overrightarrow{\mathrm{Q}}\) is \(\overrightarrow{\mathrm{R}}\). If \(\overline{\mathrm{Q}}\) is doubled, then \(\overrightarrow{\mathrm{R}}\) is doubled. If the direction of \(\overline{\mathrm{Q}}\) is reversed, then \(\overrightarrow{\mathrm{R}}\) is again doubled.

then \(\mathrm{P}^{2}: \mathrm{Q}^{2}: \mathrm{R}^{2}\) is

A
3 : 1 : 1

B
2 : 3 : 2

C
1 : 2 : 3

D
2 : 3 : 1

Question 10
4 / -1

Two men carry a weight of 240 kg between them by means of two ropes fixed to the weight. One rope is inclined at 60× to the vertical and the other at 30×. The tensions in the ropes are

A
120 kg, 120 kg

B
120√3 kg, 120 kg

C
120√3 kg, 120√3 kg

D
None of these

Submit Test

Physics Test - ...

Question 1

MLT-1A-1

MLT-2A-2

M-1L-3T4A2

M2L-2T-2A2

Question 2

4P

P/4

16P

P/16

Question 3

\(\frac{x \pi R^{2} n_{1}}{n_{2}}\)

\(\frac{x \pi R^{2} n_{2}}{n_{1}}\)

\(\frac{2 \pi R^{2} n_{1}}{n_{2}}\)

πR2x

Question 4

A

B

C

D

Question 5

Both A and B are true.

Both A and B are false.

A is true but B is false.

A is false but B is true.

Question 6

t1> t2

t1< t

t1 = t2

there is no relation

Question 7

0.2 cm

1.2 cm

2.2 cm

0.122 cm

Question 8

10 W

20 W

4 W

15 W

Question 9

3 : 1 : 1

2 : 3 : 2

1 : 2 : 3

2 : 3 : 1

Question 10

120 kg, 120 kg

120√3 kg, 120 kg

120√3 kg, 120√3 kg

None of these

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t₁ = t₂