KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 251 - 254 of 268

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Question number: 251

» Dual Nature of Matter and Radiation » De-Broglie Relation

Appeared in Year: 2016

MCQ▾

Question

Electrons accelerated from rest by an electrostatic potential are collimated and sent through a Young’s double slit setup. The fringe width is . If the accelerating potential is doubled then the width is now close to –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 252

» Dual Nature of Matter and Radiation » Particle Nature of Light

Appeared in Year: 2016

MCQ▾

Question

Photons of wavelength are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular are of radius by a perpendicular magnetic field having a magnitude . The work function of the metal is –

(Where symbols have their usual meanings)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 253

» Oscillations and Waves » Speed of a Wave

Appeared in Year: 2016

MCQ▾

Question

A hearing test is conducted on an aged person. It is found that her threshold of hearing is 20 decibels at and it rises linearly with frequency to decibels at . The minimum intensity of sound that the person can hear at is –

Choices

Choice (4) Response

a.

times than that at

b.

times than that at

c.

times than that at

d.

times than that at

Question number: 254

» Properties of Solids & Liquids » Young's Modulus

Appeared in Year: 2016

MCQ▾

Question

A monochromatic light source of wavelength is placed slightly above a plane mirror as shown. Image of in can be used as a virtual source to produce interference fringes on the screen. The distance of source from is , and the distance of screen from is (figure is not to scale). If the angle radians, the width of the interference fringes observed on the screen is –

Quadrilateral poly1 Quadrilateral poly1: Polygon A, B, C, DAngle α Angle α: Angle between E, B, ASegment a Segment a: Segment [A, B] of Quadrilateral poly1Segment b Segment b: Segment [B, C] of Quadrilateral poly1Segment c Segment c: Segment [C, D] of Quadrilateral poly1Segment d Segment d: Segment [D, A] of Quadrilateral poly1Segment f Segment f: Segment [E, B] Segment g Segment g: Segment [F, G] Point E E = (-3.4,3.74) Point E E = (-3.4,3.74) SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”SO = 20.0 cm text1 = “SO = 20.0 cm”S text1_1 = “S”M text1_2 = “M”O text1_3 = “O” heta text1_4 = “ heta”Screen text1_5 = “Screen”Screen text1_5 = “Screen”Screen text1_5 = “Screen”Screen text1_5 = “Screen”Screen text1_5 = “Screen”Screen text1_5 = “Screen”

an Experimental Setup With Monochromatic Light

In figure a monochromatic light source S of wavelength 440 nm is placed slightly above a plane mirror M is shown.

Choices

Choice (4) Response

a.

b.

c.

d.

f Page
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