CBSE Class 12 Board Examination Practice Quiz

Question 1

A circular coil of $100$ turns and radius $0.10\,\text{m}$ is placed with its plane perpendicular to a uniform magnetic field. If the magnetic field changes uniformly from $0.20\,\text{T}$ to $0.60\,\text{T}$ in $0.20\,\text{s}$, the magnitude of induced emf is closest to:

Accepted Answer

$2\pi\,\text{V}$

Question 2

For the first order reaction $A \rightarrow B$, the rate constant is $k=2.303\times 10^{-3}\,\text{s}^{-1}$. The time required for $90\%$ completion of the reaction is:

Accepted Answer

$1000\,\text{s}$

Question 3

The general solution of the differential equation $\frac{dy}{dx}+y=e^{-x}$ is:

Accepted Answer

$y=xe^{-x}+Ce^{-x}$

Question 4

A firm has credit sales of $\text{₹}6,00,000$, debtors at the beginning $\text{₹}80,000$, and debtors at the end $\text{₹}1,20,000$. The average collection period, assuming $360$ days in a year, is:

Accepted Answer

$60$ days

Question 5

Which one of the following events is correctly associated with the year $1930$ in the Indian national movement?

Accepted Answer

Beginning of the Civil Disobedience Movement through the Dandi March

CBSE Class 12 Board Examination

Practice Quizzes

CBSE Class 12 Board Examination Practice Quiz

Electrostatic Potential and Capacitance Fundamentals | CBSE Class 12 Board Examination