NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension: Questions 630 - 633 of 828

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Question number: 630

» 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: 631

» Mathematics » Direct and Inverse Variation

MCQ▾

Question

Two candles have different lengths and thickness. The shorter lasts 11 h and the longer 7 h when both are lit simultaneously. If after 3 h of their being lit together at the same time, both have the same length, then the ratio of their original lengths is

Choices

Choice (4) Response

a.

10: 13

b.

7: 11

c.

11: 14

d.

5: 8

Question number: 632

» 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: 633

» 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

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