KVPY Stream-SA (Class 11) Physics: Questions 83 - 86 of 252

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Question number: 83

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

For an equal-convex lens of radius of curvature 25, the object placed in a medium of refractive index 1.33. On the image side the refractive index is 1.75. The focal length of this lens will be,

Choices

Choice (4) Response

a.

51 cm

b.

79.16 cm

c.

69.26 cm

d.

88.55 cm

Question number: 84

» Thermodynamics » Concept of Temperature

Appeared in Year: 2014

MCQ▾

Question

A thin paper cup filled with water does not catch fire when placed over a flame. This is because

Choices

Choice (4) Response

a.

Paper is a poor conductor of heat

b.

The paper cup does not become appreciably hotter than the water it contain

c.

The water cuts off oxygen supply to the paper cup

d.

Water is an excellent conductor of heat

Question number: 85

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2014

MCQ▾

Question

Two positively charged spheres of masses m1, and m2, are suspended from a common point at the ceiling by identical insulating massless strings of length l. Charges on the two spheres are q1 and q2, respectively. At equilibrium both strings make the same angle θ with the vertical. Then

Choices

Choice (4) Response

a.

q2m1=q1m2

b.

q1m1=q2m2

c.

m1=m2

d.

m1=m2sinθ

Question number: 86

» Current Electricity » Series and Parallel Combinations of Resistors

Appeared in Year: 2014

MCQ▾

Question

Consider the circuit shown below where all resistors are of 1kΩ.

Circuit diagram of nine resistors

Circuit Diagram of Nine Resistors

In figure combination of nine resistors are connected between P and Q.

If a current of magnitude 1 mA flows through the resistor marked X, what is the potential difference measured between points P and Q?

Choices

Choice (4) Response

a.

55 V

b.

34 V

c.

21 V

d.

68 V

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