Explore topic-wise MCQs in SRMJEEE .

This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your SRMJEEE knowledge and support exam preparation. Choose a topic below to get started.

1.

Nuclei which do not emit radiations naturally are called

A. unstable nuclei
B. stable nuclei
C. positive nuclei
D. negative nuclei
Answer» C. positive nuclei
2.

Phenomenon in which radiations split matter in to ions is called

A. denaturing
B. ionization
C. condensation
D. atomization
Answer» C. condensation
3.

Technimum-99 has half-life of 6 hours. If there is 300 mg of it, how much will be left in 48 hours?

A. 1.58 mg
B. 1.25 mg
C. 1.17 mg
D. 2.56 mg
Answer» D. 2.56 mg
4.

Radiations that can ionize matter are

A. alpha radiations
B. alpha radiations
C. beta radiations
D. all beta, alpha and gamma radiations
Answer» E.
5.

Radium-226 has a half-life of

A. 1160 years
B. 1340 years
C. 1580 years
D. 1620 years
Answer» E.
6.

A stream of high energy electrons is

A. alpha radiation
B. gamma radiation
C. both alpha and beta radiations
D. beta radiation
Answer» E.
7.

A process in which heavy nucleus splits into two by bombarding a slow moving neutron is called

A. radioactivity
B. nuclear fusion
C. nuclear fission
D. nuclear spilitting
Answer» D. nuclear spilitting
8.

 Half-life of Carbon-14 is

A. 23 years
B. 1000 years
C. 1200 years
D. 5730 years
Answer» E.
9.

Radiation which primarily consists of protons, electrons, alpha particles and large nuclei are called

A. environmental radiations
B. background radiations
C. positive radiations
D. cosmic radiations
Answer» E.
10.

Radiation which strongly interacts with matter due to its charge and has a short range as compared to gamma radiations is

A. alpha radiation
B. beta radiation
C. no radiation
D. none of the above
Answer» C. no radiation
11.

In fission, mass of products is

A. less than original nucleus
B. more than original nucleus
C. equal to original nucleus
D. both B and C
Answer» B. more than original nucleus
12.

 If activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then sample's half life will be

A. 3 days
B. 10 days
C. 5 days
D. 7 days
Answer» D. 7 days
13.

In nuclear fission, as compared to original mass of heavy nucleus, total mass of product is

A. equal
B. more
C. less
D. zero
Answer» D. zero
14.

In alpha decay (α-decay) proton number of parent nuclide

A. increases by 2
B. increases by 1
C. decreases by 2
D. decreases by 4
Answer» D. decreases by 4
15.

Number of protons and neutrons in nucleus is called

A. neutron number (N)
B. atomic number (Z)
C. atomic mass number (A)
D. electron number (E)
Answer» D. electron number (E)
16.

Fast moving light photons is

A. alpha radiation
B. gamma radiation
C. both alpha and beta radiations
D. beta radiation
Answer» C. both alpha and beta radiations
17.

Number of neutrons in nucleus is called

A. neutron number (N)
B. atomic number (Z)
C. atomic mass number (A)
D. electron number (E)
Answer» C. atomic mass number (A)
18.

Compound containing some amount of radioisotope is

A. tracer
B. radioactive compound
C. non radioactive
D. linear active compound
Answer» B. radioactive compound
19.

Most of nuclei with atomic number 1 to 82 are

A. positive nuclei
B. negative nuclei
C. unstable nuclei
D. stable nuclei
Answer» E.
20.

If a radioactive element has a half-life of 40 minutes. initial count rate was 1000 per minute, then how long will it take for count rate to drop to 125 per minutes

A. 120 minutes
B. 90 minutes
C. 30 minutes
D. 60 minutes
Answer» B. 90 minutes
21.

Positive charge in an atom was concentrated in a small region called

A. atomic mass
B. electron
C. proton
D. nucleus
Answer» E.
22.

Age of fossil when C-14: C-12 in bone is one fourth of ratio in bone of living animal andhalf-life of C-14 is 5732 years is

A. 100 years
B. 11460 years
C. 1000 years
D. 1200 years
Answer» C. 1000 years
23.

Elements whose atomic number is greater than 82 are naturally

A. unstable nuclei
B. stable nuclei
C. positive nuclei
D. negative nuclei
Answer» B. stable nuclei
24.

 During natural radioactivity unstable nucleus disintegrates to become more

A. stable
B. unstable
C. excited
D. unexcited
Answer» B. unstable
25.

Nuclei with atomic number 1 to 82 are

A. stable
B. unstable
C. moderately stable
D. radioactive
Answer» B. unstable
26.

 Beta particles are stream of high energy

A. electrons
B. protons
C. photons
D. positrons
Answer» B. protons
27.

Phenomenon by which radiations split matter into negative and positive ions is called

A. ionization
B. radiation
C. transmutation
D. radioactivity
Answer» B. radiation
28.

Radiation emitted from splits into

A. 2 components
B. 4 components
C. 5 components
D. 3 components
Answer» E.
29.

 Number of protons inside nucleus represents

A. atomic mass
B. atomic number
C. atomic count
D. radioactivity level
Answer» C. atomic count
30.

 Isotopes have same number of protons but different number of

A. electrons
B. neutrons
C. shells
D. positrons
Answer» C. shells
31.

In air, alpha particles have range of

A. few centimeters
B. several thousand meters
C. several hundred meters
D. several meters
Answer» B. several thousand meters
32.

Gamma (γ) radiation are fast moving

A. electrons
B. protons
C. photons
D. neutrons
Answer» D. neutrons
33.

Radiations present in atmosphere due to different radioactive substances are called

A. environmental radiations
B. background radiations
C. positive radiations
D. cosmic radiations
Answer» C. positive radiations
34.

A helium nucleus comprising of two protons and two neutrons with a charge of 2e is

A. beta particle
B. gamma particle
C. alpha particle
D. negative particle
Answer» D. negative particle
35.

In SI base units, 1 Bq is equal to

A. 10 disintegration per second
B. 1.5 disintegration per second
C. 0.01 disintegration per second
D. 1 disintegration per second
Answer» E.
36.

Elements which emit natural radioactivity are known as

A. radio elements
B. active elements
C. radioactive elements
D. nuclear elements
Answer» D. nuclear elements
37.

When two light nuclei combine to form a heavier nucleus, process is said to be

A. nuclear fission
B. nuclear fusion
C. nuclear power
D. nuclear transmutation
Answer» C. nuclear power
38.

Alpha (α) particles are helium (He) nucleus with a charge of

A. e
B. 2e
C. 3e
D. 4e
Answer» C. 3e