KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 81 - 83 of 268

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Question number: 81

» Current Electricity » Wheatstone Bridge

Appeared in Year: 2012

MCQ▾

Question

As shown in the figure below, a cube is formed with ten identical resistors R (thick lines) and two shorting wires (dotted lines) along the arms AC and BD.

A cube form of ten identical resistors

A Cube Form of Ten Identical Resistors

In figure a cube is formed with ten identical resistors R and two shorting wires.

Resistance between point A and B is –

Choices

Choice (4) Response

a.

R2

b.

3R4

c.

5R6

d.

R

Question number: 82

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2013

MCQ▾

Question

In a photocell circuit the stopping potential, V0, is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency ν of incident light.

Graph of stopping potential verses frequency

Graph of Stopping Potential Verses Frequency

In figure graph of stopping potential verses frequency is shown.

The values of Plank’s constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be e = 1.6 × 10– 19 C)

Choices

Choice (4) Response

a.

6.0×1034Js,3.2eV

b.

6.4×1034Js,2.0eV

c.

6.4×1034Js,3.2eV

d.

6.0×1034Js,2.5eV

Question number: 83

» Electrostatics » Forces Between Two Point Charges

Appeared in Year: 2013

MCQ▾

Question

Consider an initially neutral hollow conducting spherical shell with inner radius r and outer radius 2r. A point charge + Q is now placed inside the shell at a distance r2 from the centre. The shell is then grounded by connecting the outer surface to the earth. P is an external point at a distance 2r from the point charge + Q on the line passing through the centre and the point charge + Q as shown in the figure.

A hollow conducting spherical shell

A Hollow Conducting Spherical Shell

Figure shows, a hollow conducting spherical shell with inner radius r and outer radius 2r. A point charge + Q is placed inside the shell at a distance r/2 from center and P is an external point at distance 2r from the point charge + Q.

The magnitude of the force on a test charge + q placed at P will be –

Choices

Choice (4) Response

a.

14πε04qQ25r2

b.

14πε0qQ4r2

c.

0

d.

14πε09qQ100r2

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