KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 182 - 185 of 268

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Question number: 182

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

MCQ▾

Question

The flat face of a Plano-convex lens of focal length 20 cm is silvered. A point source placed 50 cm in front of the curved surface will produced a –

Choices

Choice (4) Response

a.

Virtual image 12.5 cm away from the lens

b.

Real image 25 cm away from the lens

c.

Virtual image 25 cm away from the lens

d.

Real image 12.5 cm away from the lens

Question number: 183

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2013

MCQ▾

Question

A metallic prong consists of 4 rods made of the same material, cross-section and same lengths as shown. The three forked ends are kept at 1000 C and the handle end is at 00C. The temperature of the junction is

A metallic prong consists of 4 rods

A Metallic Prong Consists of 4 Rods

In figure a metallic prong consists of 4 rods made of the same material, cross-section and same lengths.

Choices

Choice (4) Response

a.

500C

b.

250C

c.

750 C

d.

600 C

Question number: 184

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2013

MCQ▾

Question

A singly ionized helium atom in an excited state (n = 4) emits a photon of energy 2.6 eV. Given that the ground state energy of hydrogen atom is -13.6 eV, the energy Equation and quantum number (n) of the resulting state are respectively,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 185

» Rotational Motion » Concepts of Rotational Motion

Appeared in Year: 2015

MCQ▾

Question

A uniform cylinder of mass M and radius R is rotated freely about a stationary horizontal axis O. On cylinder a cord of length l and mass m is wound in a single layer. The wound part of the cord is supposed to have it centre of gravity on the cylinder axis. The angular acceleration of the cylinder as a function of the length x of the hanging part of the cord is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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