Physics (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 54 - 58 of 78

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Question number: 54

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 Ω, the electrical resistivity of the material is

Choices

Choice (4) Response

a.

1.1×106Ω.m

b.

0.22×10 - 6Ω. m

c.

4.4×106Ω.m

d.

2.2×106Ω.m

Question number: 55

» Physics » Sound

MCQ▾

Question

If one puts ones ears to the steel rail, the sound of a coming train can be heard even when the train cannot be seen. One can conclude from this observation that

I. sound travels faster in steel than in air.

II. amplitude of sound in the rail is much larger than in air.

III. sound can travel larger distances in solids than in air.

IV. quality of sound in rail is better than in air.

The reasonable conclusions are

Choices

Choice (4) Response

a.

I and II

b.

I and III

c.

II and III

d.

None of the above

Question number: 56

» Physics » Sound

MCQ▾

Question

Which one of the following statements is wrong?

Choices

Choice (4) Response

a.

Sound travels in the form of waves

b.

Sound travels in straight line

c.

Sound travels faster in vacuum than in air

d.

Sound is a form of energy

Question number: 57

» Physics » Sound

MCQ▾

Question

Synonym for Quality is

Choices

Choice (4) Response

a.

Timbre

b.

loudness

c.

intensity

d.

frequency

Question number: 58

» Physics » Light

MCQ▾

Question

Which one of the following is not correct about cathode rays?

Choices

Choice (4) Response

a.

They are deflected to the positive plate of electromagnetic field

b.

The nature of cathode rays does not depend upon the nature of gas taken in the discharge tube

c.

The nature of cathode rays depends upon the nature of gas taken in the discharge tube

d.

Cathode rays are made up of material particles

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