Physics Test

Result

Physics Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

In a n-type semiconductor, which of the following statement is true?

A

Electron are minority carriers and pentavalent atoms are dopants

B

Holes are majority carriers and trivalent atoms are dopants

C

Holes are minority carriers and pentavalent atoms are dopants

D

Electrons are majority carriers and trivalent atoms are dopants
Question 2
1 / -0

A

9 J

B

6 J

C

13 J

D

15 J
Question 3
1 / -0

A

Option A

B

Option B

C

Option C

D

Option D
Question 4
1 / -0

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is

A

3g/2L

B

g/L

C

2g/L

D

2g/3L
Question 5
1 / -0

A, B and C are three points in a uniform electric field. The electric potential is

A

Same at all the three points A, B and C

B

Maximum at B

C

Maximum at C

D

Maximum at A
Question 6
1 / -0

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)

A

6.675 MeV

B

26.7 MeV

C

2.67 MeV

D

13.35 MeV
Question 7
1 / -0

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2 m? (g is the acceleration due to gravity)

A

3 mg

B

2 mg

C

Zero

D

6 mg
Question 8
1 / -0

A gas is taken through the cycle A → B → C → A, as shown. What is the net work done by the gas?

A

Zero

B

2000 J

C

1000 J

D

− 2000 J
Question 9
1 / -0

The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be

A

1.0 A

B

0.2 A

C

0.1 A

D

2.0 A
Question 10
1 / -0

During an experiment with a metre bridge, the galvanometer shows a null point when the jockey is pressed at 40.0 cm using a standard resistance of 90 Ω, as shown in the figure. The least count of the scale used in the metre bridge is 1 mm. The unknown resistance is

A

60 ± 0.25Ω

B

135 ± 0.23Ω

C

135 ± 0.56Ω

D

60 ± 0.15Ω