Practice MCQ Questions and answers on General Science-GK

91

Which of the following shows the masses of the three elementary particles in decreasing order?

A) Leptons, Baryons, Mesons B) Mesons, Baryons, Leptons C) Baryons, Mesons, Leptons D) Leptons, Mesons Baryons

Discuss

Answer & Solution

Answer: Option C

Solution:

Baryons, Mesons, Leptons shows the masses of the three elementary particles in decreasing order.

92

What is the wavelength of visible spectrum?

A) 8500 - 9800 angstrom B) 7800 - 8000 angstrom C) 3900 - 7600 angstrom D) 1300 - 3000 angstrom

Discuss

Answer & Solution

Answer: Option C

Solution:

3900 - 7600 angstrom is the wavelength of visible spectrum.

93

Which of the following has a least penetrating power?

A) All have same penetrating power B) Beta Particles C) Alpha particles D) Gamma rays

Discuss

Answer & Solution

Answer: Option C

Solution:

Alpha is the least penetrating, while gamma is the most penetrating. Radiation can be harmful, but it can also be useful.

94

The isotope of uranium capable of sustaining chain reaction is

A) U-235 B) U-245 C) U-239 D) U-238

Discuss

Answer & Solution

Answer: Option A

Solution:

The isotope of uranium capable of sustaining chain reaction is U-235.

95

The age of most ancient geological formations is estimated by

A) Ra - Si method B) Potassium - argon method C) C¹⁴ method D) Uranium - lead method

Discuss

Answer & Solution

Answer: Option D

Solution:

The Uranium Lead Method, also known as the U-Pb method, is one of the most ancient and reliable radiometric dating methods. It is used to date rocks and crystals that were formed more than a billion years ago. It has a range of dating samples that are about 1billion to 4.5billion years old. It has a precision rate of 0.1−1 percent.

96

Who suggested that most of the mass of the atom is located in the nucleus?

A) Thompson B) Bohr C) Rutherford D) Einstein

Discuss

Answer & Solution

Answer: Option C

Solution:

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.

97

The dark lines in the solar spectrum are due to

A) Absorption of corresponding wavelengths by the outer layers of the sun. B) Destructive interference between waves of certain definite wavelengths. C) Absorption of corresponding wavelengths by the prism used in the photograph. D) Absence of corresponding wavelengths from the light emitted by the core of the sun.

Discuss

Answer & Solution

Answer: Option A

Solution:

Absorption of corresponding wavelengths by the outer layers of the sun.

98

In an atomic nucleus, neutrons and protons are held together by:

A) Gravitational forces B) Exchange forces C) Coulombic forces D) Magnetic forces

Discuss

Answer & Solution

Answer: Option B

Solution:

In an atomic nucleus, neutrons and protons are held together by exchange forces.

99

'No two electrons in an atom can have the same set of four quantum numbers' is stated in

A) Newton's law B) Bohr's law C) Aufbau principle D) Pauli's exclusion principle

Discuss

Answer & Solution

Answer: Option D

Solution:

'No two electrons in an atom can have the same set of four quantum numbers' is stated in Pauli's exclusion principle.

100

According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called:

A) A molecule B) A cation C) An anion D) An atom

Discuss

Answer & Solution

Answer: Option A

Solution:

Smallest particle of an element or a compound which is capable of independent existence is called molecule. A molecule is formed when two or more atoms join together chemically.