Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

An a-particle and a proton of the same kinetic energy are in turn allowed to pass through a magnetic field `vec"B"`, acting normal to the direction of motion of the particles. Calculate the ratio of radii of the circular paths described by them.

Differentiate between amplitude modulated (AM) and frequency modulated (FM) waves by drawing suitable diagrams. Why is FM signal preferred over AM signal?

A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.

1. What is the rms value of current in the circuit?
2. What is the net power consumed over a full cycle?

A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.

What is the net power consumed over a full cycle?

Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of `""_86^220"Rn"`.

Given `"m"(""_88^226"Ra")` = 226.02540 u, `"m"(""_86^222 "Rn")` = 222.01750 u, 

`"m"(""_86^220 "Rn")`= 220.01137 u, `"m"(""_84^216 "Po")`= 216.00189 u.

Effective voltage V_rms is related to peak voltage V_o by ______.

If V_m and I_m are peak voltage and current, impedance Z in an AC circuit is ______.

Atomic mass unit (u) is defined as ________ of the mass of the carbon (¹²C) atom.

Nuclear species or nuclides are shown by the notation ________ where X is the chemical symbol of the species.

\[\ce{^197_79Au}\] contains ______.

The nuclei of isotopes of a given element contain the same number of ______.

All nuclides with same mass number A are called ______.

Nuclides with same neutron number N but different atomic number Z are called ______.

A nucleus of mass number A has a radius R such that ______.

The total current in a semiconductor is ______.

A generator has an e.m.f. of 440 Volt and internal resistance of 4000 hm. Its terminals are connected to a load of 4000 ohm. The voltage across the load is ______.