Physics 2025 Question Paper Online Test (12th Standard)

Q1

In the combination of the following gates, write the Boolean equation for output Y in terms of input A, B, C.

Logic circuit: A through a NOT gate and B into a NOR gate; its output and C into a NAND gate giving Y

A.\(\overline{A}\,B\,\overline{C}\) B.\(A\,\overline{B}\,C\) C.\(\overline{A}+\overline{B}+\overline{C}\) D.\(\overline{A}+B+\overline{C}\)

Q2

If a material having intensity of magnetisation 500 \(Am^{-1}\) is placed in a magnetising field of 1000 \(Am^{-1}\), then the susceptibility of the material is :

A.0.2 B.0.8 C.0.7 D.0.5

Q3

In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6 A, then that in the secondary coil is :

A.12 A B.2 A C.1 A D.18 A

Q4

In Joule’s heating law, when R and t are constant, if the H is taken along the y-axis and \(I^2\) along the x-axis, the graph is :

A.circle B.straight line C.ellipse D.parabola

Q5

The dimension of \(\frac{1}{\mu_0\varepsilon_0}\) is :

A.\([L^{-1}T]\) B.\([LT^{-1}]\) C.\([L^{-2}T^{2}]\) D.\([L^{2}T^{-2}]\)

Q6

“Ski wax” is an application of nano product in the field of :

A.Sports B.Medicine C.Automotive industry D.Textile

Q7

An electric dipole is placed at an alignment angle of 30° with an electric field of \(2\times10^5\ NC^{-1}\). It experiences a torque equal to 8 Nm. The charge on the dipole if the dipole length is 1 cm is :

A.5 mC B.4 mC C.7 mC D.8 mC

Q8

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°

Q9

A radioactive element has \(N_0\) number of nuclei at t = 0. The number of nuclei remaining after half of a half-life (that is, at time \(t = \frac{1}{2}T_{1/2}\)) is :

A.\(\frac{N_0}{4}\) B.\(\frac{N_0}{2}\) C.\(\frac{N_0}{8}\) D.\(\frac{N_0}{\sqrt{2}}\)

Q10

Calculate the distance upto which ray optics is a good approximation for light of wavelength 500 nm falls on an aperture of width 0.5 mm.

A.20 cm B.25 m C.25 cm D.30 cm

Q11

First diffraction minimum due to a single slit of width \(1.0\times10^{-5}\) cm is at 30°. Then wavelength of light used is :

A.600 Å B.400 Å C.700 Å D.500 Å

Q12

A thin conducting spherical shell of radius R has a charge Q which is uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is :

A.(figure A)

Option A: V rises linearly up to r = R then falls linearly

B.(figure B)

Option B: V zero up to r = R then jumps up and decreases

C.(figure C)

Option C: V rises linearly up to r = R then decreases as 1/r

D.(figure D)

Option D: V constant up to r = R then decreases as 1/r

Q13

In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then, the maximum possible velocity of the emitted electron will be :

A.\(2\sqrt{\frac{h\nu_0}{m}}\) B.\(\sqrt{\frac{h\nu_0}{m}}\) C.\(\sqrt{\frac{h\nu_0}{2m}}\) D.\(\sqrt{\frac{6h\nu_0}{m}}\)

Q14

To obtain sustained oscillation in an oscillator,

A.Feedback factor must be unity B.Phase shift must be 0 or \(2\pi\) C.Feedback should be positive D.All the above

Q15

The transverse nature of light is shown in :

A.scattering B.interference C.polarisation D.diffraction

12th Standard Physics March 2025: Online Practice Test

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