Atoms Test

Result

Atoms Test - 21

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following is NOT a postulate of Bohr's model of the hydrogen atom?

A

Gases excited by a voltage emits a bright-light emission spectrum.

B

The position of an electron in the hydrogen atom is not defined.

C

Electron absorbs energy to make transition to a higher energy level.

D

Electron emits energy when it makes transition to a lower energy level.

E

The energy levels of the electron are quantized.

Solution

Bohr showed that the electron in the hydrogen atom could only be found in certain selected (quantized) orbits, and no others.
Question 2
1 / -0

Identify which of the following is the smallest discrete value of electromagnetic energy ?

A
photon

B
proton

C
electron

D
neutron

E
quark

Solution

Quantum is the minimum amount of any physical entity involved in an interaction. It is a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents. It implies that the magnitude of the physical property can take on only certain discrete values.
A photon is a quantum of electromagnetic energy, which means, that the electromagnetic energy is composed of a number of the smallest particles possible called photons, whose energy depends upon the frequency of them.
Question 3
1 / -0

Who proposed the planetary model of the atom?

A
Earnest Rutherford

B
Max Planck

C
Neils Bohr

D
James Chadwick

E
J.J. Thompson

Solution

Neils Bohr proposed the planetary model of the atom in 1913 that the electrons revolve in a fixed orbit around the nucleus just as all the planets revolve around the sun in solar system.
Question 4
1 / -0

Packets of which of the following quantity best describe photons ?

A
energy

B
mass

C
volume

D
power

E
waves

Solution

Modern physicists demonstrate that energy in an electromagnetic field is made up of discrete packets. These packets are of energy are termed as photons. This is the reason behind the particle like behavior of light.
Energy of each photon in a wave of wavelength $$\lambda$$ is $$E=\dfrac{hc}{\lambda}$$.
Question 5
1 / -0

Which of the following conclusions can be drawn from the Rutherford alpha scattering model?
I. The atom is mostly empty space.
II. Electrons orbit the nucleus of the atom.
III. The atom has a dense, positively charged nucleus.

A
I only

B
II only

C
I and II only

D
II and III only

E
I, II, and III

Solution

All three of the statements describe the conclusions reached by Rutherford as a result of his alpha-scattering experiment.
Question 6
1 / -0

Corpuscles are the tiny particles of

A
Light

B
Sound

C
Waves

D
Radiation

Solution

According to the Corpuscles theory, corpuscles are the tiny particles of light.
Question 7
1 / -0

Spectrum of sunlight is an example for

A
Band emission spectrum

B
Line absorption spectrum

C
Continuous emission spectrum

D
Continuous absorption spectrum

Solution

Dark/Bright light seen in an otherwise uniform and continous spectrum is a spectral line, this is due to emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
Spectrum of sunlight is an example for line absorption spectrum
Question 8
1 / -0

In a cathode ray oscillograph, the focusing of beam on the screen is achieved by

A
Convex lens

B
Magnetic field

C
Electric potential

D
All of these

Solution

In the oscilloscope, the signal to be studied is first amplified and then applied to the vertical plate to deflect the beam vertically and at the same time, a voltage that increases linearly with time is applied to the horizontal plate thus causing the beam to be deflected horizontally. The signal applied to the vertical plate is thus displayed on the screen as a function of time.

Hence focussing of beam on screen is achieved by changing electric potential or the voltage with time across the horizontal plate.
Question 9
1 / -0

The concept of stationary orbits was proposed by.

A
J. J. Thomson

B
Rutherford

C
Neil Bohr

D
LNewton

Solution

Neil Bohr proposed the concept of stationary orbits in 1913, which is now called the Bohr model of atom. The electron can only orbit stably, without radiating, in certain orbits at a certain discretesct of distance from the nucleus.
Question 10
1 / -0

The size of the nucleus varies as __________ power of the atomic number.

A
$$1/2$$

B
$$2$$

C
$$1/3$$

D
$$3$$

Solution

We know that the cube of radius of nucleus is directly proportional to the atomic mass.

$$R^3\alpha A$$

$$R\alpha A^{\frac13}$$

$$R=R_0A^{\frac13}$$

Where, $$R $$ is the Radius of the nucleus

$$R_0$$ is Fermi Constant

So, the radius of a nucleus is proportional to the cube root of its mass number.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Atoms Test - 21

Result

Atoms Test - 21

Score

-

Rank

-

SHARING IS CARING

Question 1

Gases excited by a voltage emits a bright-light emission spectrum.

The position of an electron in the hydrogen atom is not defined.

Electron absorbs energy to make transition to a higher energy level.

Electron emits energy when it makes transition to a lower energy level.

The energy levels of the electron are quantized.

Solution

Question 2

photon

proton

electron

neutron

quark

Solution

Question 3

Earnest Rutherford

Max Planck

Neils Bohr

James Chadwick

J.J. Thompson

Solution

Question 4

energy

mass

volume

power

waves

Solution

Question 5

I only

II only

I and II only

II and III only

I, II, and III

Solution

Question 6

Light

Sound

Waves

Radiation

Solution

Question 7

Band emission spectrum

Line absorption spectrum

Continuous emission spectrum

Continuous absorption spectrum

Solution

Question 8

Convex lens

Magnetic field

Electric potential

All of these

Solution

Question 9

J. J. Thomson

Rutherford

Neil Bohr

LNewton

Solution

Question 10

$$1/2$$

$$2$$

$$1/3$$

$$3$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-