Chapter (1)- Atomic Structure (1)

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Q1. Cathode rays are deflected by - *

1 point

an electric field only

by both electrical and magnetic field

magnetic field only

by none

Q2. Which of the following statement is not correct about the characteristics of cathode rays? *

1 point

They start from the cathode and move towards the anode

They travel in straight line in the absence of an external electrical or magnetic field.

Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.

Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.

Q3. Which of the following statements about the electron is incorrect? *

1 point

It is negatively charged particle

The mass of electron is equal to the mass of neutron.

It is a basic constituent of all atoms.

It is a constituent of cathode rays.

Q4. While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ? *

1 point

Dust particles are present in air

Carbon dioxide is present in air

Air is a poor conductor of electricity under normal conditions

None of the above

Q5. Which is not true with respect to cathode rays? *

1 point

A stream of electrons

Charged particles

Move with speed same as that of light

Can be deflected by magnetic fields

Q6. What is the optimum conditions required to study the conduction of electricity through gases. *

1 point

High pressure and low voltage

High pressure and high voltage

Low pressure and high voltage

Low pressure and low voltage

Q7. In discharge tube experiment stream of negatively charged particles travel from - *

1 point

anode to cathode

cathode to anode

Both (a) and (b)

Electrons does not travel

Q8. The discovery of neutron became very late because - *

1 point

neutrons are present in nucleus

neutrons are chargeless

neutrons are fundamental particles

all of the above

Q9. Which is correct statement about proton ? *

1 point

Proton is nucleus of deuterium

Proton is alpha-particle

Proton is ionized hydrogen molecule

Proton is ionized hydrogen atom

Q10. The lightest particle is : *

1 point

alpha-particle

proton

positron

neutron

Q11. Neutron is discovered by *

1 point

Chadwick

Yukawa

Goldstein

Rutherford

Q12. When beryllium is bombarded with alpha particles(Chadwick’s experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are given out. These are : *

1 point

Electron

Proton

Neutron

Positron

Q13. Suppose beam containing all three fundamental subatomic particles are allowed to pass through an electric field as shown in figure. The subatomic particles detected at three points A, B and C on the screen respectively are ? *

1 point

Protons, neutrons, electrons

Electrons, neutrons, protons

Electrons, protons, neutrons

Neutrons, protons, electrons

Q14. Electron has Mass - *

1 point

1.67 x 10^24 gms

1.67 x 10^-24 gms

9.1 x 10^-28 gms

9.1 x 10^28 gms

Q15. Proton has charge - *

1 point

- 1.6 x 10^-19 c

+ 1.6 x 10^-19 c

+ 9.1x 10^-19 c

- 9.1x 10^-19 c

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