NEST (National Entrance Screening Test) Physics: Questions 14 - 18 of 58

Access detailed explanations (illustrated with images and videos) to 58 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Unlimited Access for Unlimited Time! View Sample Explanation or View Features.

Rs. 100.00 or

How to register?

Question number: 14

» Atoms and Nuclei » Half Life and Mean Life

Edit

Appeared in Year: 2008

MCQ▾

Question

A sample of radioactive nuclei of a certain element can decay by both emission and emission. The half – life for emission is minutes and that for emission is minutes. The half – life for the sample is nearly –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 15

» Thermodynamics » Thermodynamic Processes

Edit

Appeared in Year: 2007

MCQ▾

Question

of hydrogen gas at standard temperature and pressure are contained in a cylinder with a movable piston. The walls of the cylinder and also the piston are insulated. If the gas is compressed to one third of its original volume, the pressure of the gas will be –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 16

» Dual Nature of Matter and Radiation » Black-Body Radiation

Edit

Appeared in Year: 2008

MCQ▾

Question

The intensity of solar radiation received by the Earth is . Assuming the Earth to be a perfect spherical blackbody, its equilibrium temperature is nearly –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 17

» Kinetic Theory of Gases » Kinetic Energy and Temperature

Edit

Appeared in Year: 2008

MCQ▾

Question

moles of nitrogen gas is kept in a canister at a temperature of . Due to a leak in the canister the pressure drops to of its original value and the temperature drops to . Assuming nitrogen to be an ideal gas, the amount of nitrogen (in moles) that has leaked out is –

Choices

Choice (4)Response

a.

12

b.

24

c.

7.5

d.

6

Question number: 18

» Wave Optics » Brewster's Law

Edit

Appeared in Year: 2009

MCQ▾

Question

An unpolarised monochromatic beam of light is incident on a planar interface of two media of refractive index and respectively, at an angle of incidence . It is found that the reflected beam is completely polarised. From this, we can conclude that –

Quadrilateral poly1Quadrilateral poly1: Polygon A, B, C, DQuadrilateral poly2Quadrilateral poly2: Polygon D, C, E, FAngle αAngle α: Angle between I, J, HAngle αAngle α: Angle between I, J, HAngle βAngle β: Angle between K, J, HAngle βAngle β: Angle between K, J, HSegment gSegment g: Segment [G, H] Segment hSegment h: Segment [I, J] Segment hSegment h: Segment [I, J] Segment hSegment h: Segment [I, J] Segment iSegment i: Segment [J, K] Segment iSegment i: Segment [J, K] Segment iSegment i: Segment [J, K] Itext1 = “I”IItext1_1 = “II”IItext1_1 = “II”itext1_2 = “i”rtext1_3 = “r”

A Beam of Light Incident on Interface of Two Media

In figure an unpolarised monochromatic beam of light is incident on a planar interface of two media.

Choices

Choice (4)Response

a.

b.

c.

d.

Developed by: