physics

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

A. 11 B. 12 C. 23 D. 34 Correct Answer: Option B B. 12

6 years ago

In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]

A. n = 2 to n = 1 B. n = 1 to n = 2 C. n = 2…

6 years ago

Absorption line spectra exhibited by atoms is a result of?

A. change in the kinetic energy of a moving atom B. instability of the nucleons C. excitation of an electron…

6 years ago

A material of mass 1.0 x 10‾²kg undergoes a fission process which decreases its mass by 0.02 percent. Calculate the amount of energy released in the process. (c = 3.0 x 108ms‾¹)

A. 1.8 x 10²ºJ B. 1.8 x 10¹³J C. 1.8 x 10¹¹J D. 1.8 x 10¹ºJ Correct Answer: Option D…

6 years ago

The half life of a radioactive substance is 14 days. If 48g of this substance is stored, after how many days will 1.5g of the original substance remain?

A. 84 days B. 70 days C. 56 days D. 40 days Correct Answer: Option B B. 70 days

6 years ago

Borh’s theory provides evidence for the?

A. structure of the atom B. positive charge of an electron C. existence of energy level in the atom D.…

6 years ago

Calculate the inductance of an inductor whose reactance is one ohm at 50 Hz.

A. 2.00 x 10‾²H B. 6.36 x 10‾²H C. 3.18 x 10‾²H D. 4.55 x 10‾²H Correct Answer: Option C…

6 years ago

An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor?

A. 0.1J B. 0.2J C. 1.0J D. 2.0J Correct Answer: Option B B. 0.2J

6 years ago

A device used to prevent wearing away of the make and-brake contacts of an induction coil is called a\an?

A. fuse B. electroscope C. resistor D. capacitor Correct Answer: Option D D. capacitor

6 years ago

The region around a magnet in which the magnetic influence is experienced is called?

A. magnetic flux B. magnetic field C. magnetic meridian D. magnetic declination Correct Answer: Option B B. magnetic field

6 years ago
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