Modern Physics Test

Result

Modern Physics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A radioactive atom X emits X-particle to produce an atom Y which then emits an X-particle to give an atom Z

1.   The atomic number of X is less than that of Z.
2.   The atomic number of Y is less than that of Z
3.   The mass number of X is the same as that of Y

A
1, 2, 3 correct

B
1, 2 correct

C
1 correct

D
3 correct
Question 2
1 / -0

In photoelectric effect the maximum kinetic energy of ejected electrons is linearly proportional to the

A
frequency of incident radiation

B
intensity of incident radiation

C
atomic number of metal

D
mass number of metal
Question 3
1 / -0

A surface ejects electrons when illuminated by blue light but none with green light. Then photo emission is possible by light of which of the following colours

A
violet

B
red

C
yellow

D
infra-red
Question 4
1 / -0

For photoelectric effect the shopping potential depends

A
on the intensity of light

B
only on the nature of surface of the metal

C
on both the intensity of light and nature of surface of metal

D
on both the frequency of incident light and the nature of surface of metal
Question 5
1 / -0

A radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains is

A
1080

B
2430

C
3240

D
4860