KVPY Stream-SA (Class 11) Physics: Questions 65 - 68 of 242

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Question number: 65

» Kinetic Theory of Gases » Kinetic Theory of Gases

MCQ▾

Question

An ideal gas filled in a cylinder occupies volume V. The gas is compressed isothermally to the volume V4 . Now the cylinder valve is opened and the gas is allowed to leak keeping temperature same. What percentage of the number of molecules escapes to bring the pressure in the cylinder back to its original value?

Choices

Choice (4) Response

a.

30%

b.

60%

c.

40%

d.

50%

Question number: 66

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2012

MCQ▾

Question

92238U atom disintegrates to 84214Po with a half-life of 4.5×109 years by emitting six alpha particle and n electrons. Here n is:

Choices

Choice (4) Response

a.

6

b.

10

c.

4

d.

7

Question number: 67

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

Question

Solar energy is incident normally on the earth’s surface at the rate of about 2.2 MW m-2. The distance between the earth and the sun is 1.5 × 1011 m. Energy (E) and mass (m) are related by Einstein equation E = mc2 where c (3 × 108ms-1) is the speed of light in free space. The decrease in the mass of the sun is

Choices

Choice (4) Response

a.

7Gkgs

b.

5Tkgs

c.

5Gkgs

d.

7Tkgs

Question number: 68

» Ray Optics » Magnification

Appeared in Year: 2013

MCQ▾

Question

In a car a rear view mirror having a radius of curvature 1.50 m forms a virtual image of a bus located 10.0 m from the mirror. The factor by which the mirror magnifies the size of the bus is close to,

Choices

Choice (4) Response

a.

0.07

b.

0.06

c.

0.09

d.

0.08

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