The focal length of a spherical mirror is equal to:

Consider the following statements about Kyoto Protocol which held in Japan in December 1997?

(A) Involved pledges and commitments from different countries to mitigate climate change caused by greenhouse gases and ozone-depleting substances (ODS).

(B) Required all countries to reduce greenhouse gas emissions by 5% below 1990 levels by 2008–2012.

(C) High-fluorinated hydrocarbons (HFCs) are transitional replacements for chlorofluorocarbons (CFCs).

(D) Definite road maps were prepared separately for developing and developed nations to reduce emissions of CFCs and other ozone-depleting substances (ODS).

Choose the correct answer from the options given below:

In the formula "W = Fs cos $\theta$", the angle between force and displacement ($\theta$) is equal to 90$\degree$, the net work done will be:

The time period of the satellites used in TV signal transmission from one part of the world to another is:

Consider the following statements-

A. Chandrayaan-3 soft landed on southern latitude of moon

B. One important component of Chandrayaan-3 was Lunar Orbiter

C. Its components were Vikram lander and Pragyan Rover

D. The rover conducted experiments with the alpha particle X-Ray Spectrometer

Choose the correct answer from the options given below:

The atoms of different elements having the same number of neutrons but different number of protons are called as which of the following?

The number of neutrons in the most common isotope of hydrogen is: