KVPY Stream-SA (Class 11) Physics: Questions 186 - 190 of 252

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Question number: 186

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

The magnetic field at the center of hydrogen atom due to its revolving electron is –

Given: radius of electronic orbit = 0.67 Å, Velocity of the electron =2.8106ms

Choices

Choice (4) Response

a.

8.75 T

b.

9.98 T

c.

11.75 T

d.

10.12 T

Question number: 187

» Work, Energy and Power » Power

MCQ▾

Question

A person X of mass 81 kg walks up a stair case in 27 sec. Another person Y of mass 63 Kg walks up the same staircase in 7 sec. The ratio of the power generated by X to that by Y is,

Choices

Choice (4) Response

a.

19

b.

13

c.

3

d.

23

Question number: 188

» Properties of Solids & Liquids » Viscosity

MCQ▾

Question

Under a constant pressure head, the rate of flow of liquid through a capillary tube is 10m3s . If the length of the tube is halved and the diameter of the bore is doubled, the rate of flow will be –

Choices

Choice (4) Response

a.

480m3s

b.

340m3s

c.

220m3s

d.

320m3s

Question number: 189

» Current Electricity » Electric Current

MCQ▾

Question

The current in 2Ω resistance in the circuit show below is,

Circuit diagram having combination of four resistors

Circuit Diagram Having Combination of Four Resistors

In figure combination of four resistors. A battery and a capacitor is also connected in the circuit.

Choices

Choice (4) Response

a.

0.33 A

b.

0.45 A

c.

0.5 A

d.

1 A

Question number: 190

» Electrostatics » Capacitors

MCQ▾

Question

When a capacitor is connected to a battery,

Choices

Choice (4) Response

a.

There is no flow of current

b.

The current keeps on increasing, reaching a maximum value until the capacitor is fully charged.

c.

A varying current keeps on flowing in the circuit

d.

Initially a current flow in the circuit and then decreases to zero

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