Physics 2023 Question Paper Online Test (12th Standard)

Q1

The wavelength \(\lambda_e\) of an electron and \(\lambda_p\) of a photon of same energy E are related by :

A.\(\lambda_p \propto \frac{1}{\sqrt{\lambda_e}}\) B.\(\lambda_p \propto \lambda_e\) C.\(\lambda_p \propto \lambda_e^2\) D.\(\lambda_p \propto \sqrt{\lambda_e}\)

Q2

Two polaroids are kept with their transmission axes inclined at 30°. Unpolarised light of intensity I falls on the first polaroid. Intensity of light emerging from the second polaroid :

A.\(\frac{1}{8}I\) B.\(\frac{1}{4}I\) C.\(\frac{3}{8}I\) D.\(\frac{3}{4}I\)

Q3

If the magnitude of the magnetic field is \(3\times10^{-6}\) T, then the magnitude of the electric field for a electromagnetic wave is :

A.600 \(Vm^{-1}\) B.100 \(Vm^{-1}\) C.900 \(Vm^{-1}\) D.300 \(Vm^{-1}\)

Q4

There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?

Series circuit with 10 V cell, 3 ohm, 2.5 ohm and resistor P

A.3.5 \(\Omega\) B.1.5 \(\Omega\) C.4.5 \(\Omega\) D.2.5 \(\Omega\)

Q5

A carbon resistor of \((47\pm4.7)\ k\Omega\) is to be marked with rings of different colours for its identification. The colour code sequence will be :

A.Violet - Yellow - Orange - Silver B.Yellow - Green - Violet - Gold C.Green - Orange - Violet - Gold D.Yellow - Violet - Orange - Silver

Q6

In an hydrogen atom, the electron revolving in the second orbit, has angular momentum :

A.\(\frac{4h}{\pi}\) B.\(h\) C.\(\frac{2h}{\pi}\) D.\(\frac{h}{\pi}\)

Q7

In Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to :

A.\(\sqrt{2}D\) B.\(2D\) C.\(\frac{D}{\sqrt{2}}\) D.\(\frac{D}{2}\)

Q8

A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and distance between the plates are each doubled then which is the quantity that will change ?

A.Voltage B.Capacitance C.Energy density D.Charge

Q9

An electromagnetic wave is propagating in a medium with velocity \(\vec{v} = v\hat{i}\). The instantaneous oscillating electric field of this electromagnetic wave is along +Y axis, then the direction of oscillating magnetic field of the electromagnetic wave will be along :

A.+Z direction B.−Y direction C.−Z direction D.−X direction

Q10

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

A.60° B.30° C.90° D.45°

Q11

The Zener diode is primarily used as :

A.Oscillator B.Rectifier C.Voltage regulator D.Amplifier

Q12

The flux linked with a coil at any instant t is given by \(\Phi_B = 15t^2 - 50t + 250\). The induced emf at t = 3 s is :

A.−40 V B.−190 V C.40 V D.−10 V

Q13

An example of Diamagnetic material is __________.

A.Nickel B.Water C.Aluminium D.Iron

Q14

What is value of Forbidden Energy gap for silicon at room temperature ?

A.0.3 eV B.0.7 eV C.0.9 eV D.1.1 eV

Q15

The alloys used for muscle wires in Robots are :

A.Gold silver alloys B.Shape memory alloys C.Two dimensional alloys D.Gold copper alloys

12th Standard Physics March 2023: Online Practice Test

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