NEET Physics: Questions 1255 - 1258 of 2099

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Question number: 1255

» Atoms and Nuclei » Alpha-Particle Scattering Experiment

Assertion-Reason▾

Assertion (Ꭺ)

The force of repulsion between atomic nucleus and α -particle varies with distance according to inverse square law.

Reason (Ꭱ)

Rutherford did α -particle scattering experiment.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is false but Ꭱ is true
c. Ꭺ is true but Ꭱ is false
d. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 1256

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number?

Choices

Choice (4) Response
a.

RE

b.

Ev

c.

vR

d.

RE

Question number: 1257

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3. The Wein’s constant b = 2.88 x 10 6 nm K. Then

Choices

Choice (4) Response
a.

U1=0

b.

U3=0

c.

U 1 > U 2

d.

U 2 > U 1

Question number: 1258

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

MCQ▾

Question

The pressure in the tyre of a car is four times the atmospheric pressure at 300 K. If this tyre suddenly bursts, its new temperature will be (γ = 1.4)

Choices

Choice (4) Response
a.

300(4)0.42.4

b.

300(4)1.40.4

c.

300(4)1.40.4

d.

300(4)0.41.4

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