Class 12 Physics Pre Quarterly Examination 2026 Review

Fill-in-the-blank practice flashcards for XII Physics Pre Quarterly Examination 2026.

A charge configuration that produces a uniform electric field is a __________.

uniformly charged infinite plane

An electric dipole placed at an alignment angle of $30^\circ$ in an electric field of $2 \times 10^5\,\text{N\,C}^{-1}$ experiences a torque equal to $8\,\text{N\,m}$. The charge on the dipole if the dipole length is $1\,\text{cm}$ is __________.

$$8\,\text{mC}$$

The unit of electric flux is __________.

$$\text{N\,m}^2\,\text{C}^{-1}$$

A carbon resistor of $(47 \pm 4.7)\,\text{k}\Omega$ to be marked with rings of different colours for its identification has the colour code sequence __________.

Yellow - Violet - Orange - Silver

The internal resistance of a $2.1\,\text{V}$ cell which gives a current of $0.2\,\text{A}$ through a resistance of $10\,\Omega$ is __________.

$$0.5\,\Omega$$

The current density of a copper wire of cross-sectional area $10^{-6}\,\text{m}^2$ carrying a current of $2\,\text{A}$ is __________.

$$2 \times 10^6\,\text{A\,m}^{-2}$$

If a material having intensity of magnetisation $500\,\text{A\,m}^{-1}$ is placed in a magnetising field of $1000\,\text{A\,m}^{-1}$, then the susceptibility of the material is __________.

$$0.5$$

A circular coil of radius $5\,\text{cm}$ and $50$ turns carries a current of $3\,\text{A}$. The magnetic dipole moment of the coil is nearly __________.

$$1.2\,\text{A\,m}^2$$

The flux linked with a coil at any instant $t$ is given by $\phi_B = 10 t^2 - 50 t + 250$. The induced emf at $t = 3\,\text{s}$ is __________.

$$10\,\text{V}$$

In an oscillating LC circuit, the maximum charge on the capacitor is $Q$. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is __________.

$$\frac{Q}{\sqrt{2}}$$

The dimension of $\frac{1}{\mu_0 \epsilon_0}$ is __________.

$$[\text{L}^2 \text{T}^{-2}]$$

Among $\alpha\text{-rays}$, $\beta\text{-rays}$, and $\gamma\text{-rays}$, the one that is an electromagnetic wave is __________.

$$\gamma\text{-rays}$$

For light incident from air on a slab of refractive index $2$, the maximum possible angle of refraction is __________.

$$30^\circ$$

Stars twinkle due to __________.

refraction

If the dielectric strength of air is $4 \times 10^6\,\text{V\,m}^{-1}$ and the radius of a hollow sphere in a Van de Graaff generator is $R = 0.5\,\text{m}$, the maximum potential difference created is __________.

$$2 \times 10^6\,\text{V}$$

In a meter bridge experiment, if the value of resistance in the resistance box connected in the right gap is $10\,\Omega$ and the balancing length $L_1$ is $55\,\text{cm}$, the value of the unknown resistance is __________.

$$12.22\,\Omega$$

Pure water has a refractive index of $1.33$. The speed of light through pure water is approximately __________.

$$2.26 \times 10^8\,\text{m\,s}^{-1}$$

The resistance of a nichrome wire at $20^\circ\text{C}$ is $10\,\Omega$. If its temperature coefficient of resistivity is $0.004/^\circ\text{C}$, the resistance of the wire at the boiling point of water is __________.

$$13.2\,\Omega$$

The self-inductance of an air core solenoid is $4.8\,\text{mH}$. If its core is replaced by an iron core, its self-inductance becomes $1.8\,\text{H}$. The relative permeability of iron is __________.

$$375$$

The electric flux through a rectangle of sides $5\,\text{cm}$ and $10\,\text{cm}$ kept in a uniform electric field of $100\,\text{N\,C}^{-1}$ when angle $\theta = 60^\circ$ is __________.

$$0.25\,\text{N\,m}^2\,\text{C}^{-1}$$