AIIMS Physics: Questions 278 - 282 of 500

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Question number: 278

MCQ▾

Question

If the system takes 160 Cal. heat, and releases 100 cal. to sink, if source temperature is 180°C find the sink temp –

Choices

Choice (4) Response

a.

100°celsius

b.

30°celsius

c.

10°celsius

d.

120°celsius

Question number: 279

MCQ▾

Question

A body moves along the straight line by a machine delivering constant power. The ratio of distance at and moved by the body is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 280

MCQ▾

Question

The pressures of water in a pipe when the tap is open and closed are respectively and. With the open tap the velocity of water flowing is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 281

MCQ▾

Question

A metal wire of cross – sectional area is held taut at between two rigid supports with negligible tension in it. Find the tension developed in the wire if it is cooled to .

(Given of metal and )

Choices

Choice (4) Response

a.

900 N

b.

700 N

c.

760 N

d.

840 N

Question number: 282

Appeared in Year: 2003

Assertion-Reason▾

Assertion (Ꭺ)

When a beetle moves along the sand within a few tens of centimeters of a sand scorpion, the scorpion immediately turns towards the beetle and dashes towards it.

Reason (Ꭱ)

When a beetle disturbs the sand, it sends pulses along the sand’s surface. One set of pulses is longitudinal while the other set is transverse.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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