AIIMS Physics: Questions 347 - 351 of 500

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Question number: 347

» Kinetic Theory of Gases » Kinetic Energy and Temperature

MCQ▾

Question

At temperature T (in kelvin), the root mean square speed of a gas molecule is 14th times its value at 0 . Find the value of T.

Choices

Choice (4) Response

a.

15K

b.

17K

c.

20K

d.

23K

Question number: 348

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

The reactance of an inductance of 0.04H for 100 Hz A. C. is –

Choices

Choice (4) Response

a.

10.55 Ω

b.

25.12 Ω

c.

8.20 Ω

d.

9.14 Ω

Question number: 349

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A large steel wheel is to be fitted on to a shaft of the same material. At 280C , the diameter of the shaft is 10.00 cm and the diameter of the hole is 9.98 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip into the shaft?

(Give α for steel =1×105K1 ).

Choices

Choice (4) Response

a.

2280C

b.

1880C

c.

2000C

d.

1280C

Question number: 350

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

The Young’s modulus of a rubber string 10 cm long and density 1.8kgm3 , is 6×108Nm2 , is suspended on the ceiling in a room. The increase in length due to its own weight will be:

Choices

Choice (4) Response

a.

1.5m

b.

1.5×1011m

c.

1.5×105m

d.

1.5×103m

Question number: 351

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

In short wave communication waves of which of the following frequencies will be reflected back by the ionosphere layer having electron density 1018 per m3?

Choices

Choice (4) Response

a.

12 GHz

b.

9 GHz

c.

15 GHz

d.

3 GHz

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