NEET Physics: Questions 1222 - 1224 of 2098

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Question number: 1222

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A room is maintained at 20°C by a heater of resistance 20 ohm connected to 200 volt mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area l m 2 and thickness 0.2 cm. What will be the temperature outside? Given that thermal conductivity K for glass is 0.2 cal/m/°C/sec and J = 4.2 J/cal

Choices

Choice (4) Response

a.

15.24°C

b.

24.15°C

c.

15.00°C

d.

All of the above

Question number: 1223

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true?

(1) Bubble rises upwards because pressure at the bottom is greater than that at the top.

(2) As the bubble rises, its size increases.

(3) Bubble rises upwards because pressure at the bottom is less than that at the top.

(4) As the bubble rises, its size decreases.

select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 1224

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In Young’s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d > > b) from the slits. Some wavelengths are missing exactly in front of one slit. One of these wavelengths is

Choices

Choice (4) Response

a.

λ=b23d

b.

λ=2b2d

c.

λ=b26d

d.

λ=2b23d

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