Practice

Question 101

Mechanical waves transfer:

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Correct answer: (A) Energy

1 marks · 2024 · Set E

Question 102

In a stationary wave, the distance between two successive nodes and antinodes is:

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Correct answer: (B) λ/4

1 marks · 2024 · Set E

Question 103

The electric field at distance r from an infinite thin plane sheet of uniform surface charge density σ is:

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Correct answer: (B) Independent of r

1 marks · 2024 · Set E

Question 104

The electric displacement vector D:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 105

No current flows between two charged bodies connected by a conducting wire if they have the same:

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Correct answer: (C) Potential

1 marks · 2024 · Set E

Question 106

The direction of the magnetic field of a long straight wire carrying current is:

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 107

The permeability of a paramagnetic substance is:

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Correct answer: (B) Slightly more than that of vacuum

1 marks · 2024 · Set E

Question 108

If a charged particle q enters parallel to magnetic field B with velocity v, the magnetic force on it is:

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Correct answer: (A) 0

1 marks · 2024 · Set E

Question 109

Soft iron is used to manufacture electromagnets because its:

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 110

Two long, straight, parallel conductors carry equal steady currents in the same direction. They:

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Correct answer: (A) Attract each other

1 marks · 2024 · Set E

Question 111

Which is the incorrect statement about electromagnetic waves?

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 112

The electric field intensity on the surface of a charged conductor is:

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Correct answer: (A) Directed normally to the surface

1 marks · 2024 · Set E

Question 113

For a given dielectric, electronic polarizability αₑ:

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Correct answer: (C) Is independent of temperature

1 marks · 2024 · Set E

Question 114

The phenomenon responsible for the working of a transformer is:

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Correct answer: (C) Mutual induction

1 marks · 2024 · Set E

Question 115

When the speed of a DC motor increases, the current flowing through the armature:

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Correct answer: (A) Decreases

1 marks · 2024 · Set E

Question 116

In an optical fibre, the refractive index of the core material is:

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Correct answer: (C) Higher than that of the cladding

1 marks · 2024 · Set E

Question 117

Which of the following does not have zero average value in a plane electromagnetic wave?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 118

Maxwell’s equations represent fundamental laws of:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 119

A 10 V DC voltage is applied to an RC series circuit with R = 50 Ω and C = 2000 μF. The time constant is:

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Correct answer: (A) 0.1 s

1 marks · 2024 · Set E

Question 120

An AC voltage v = Vₘ sin ωt is applied to an inductor of inductive reactance Xᴸ. The current i in the inductor will be:

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Correct answer: (C) i = (Vₘ/Xᴸ) sin(ωt − π/2)

1 marks · 2024 · Set E

Question 121

If an AC current i = Iₘ sin ωt flows through a resistor R:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 122

In an LCR circuit, the discharge will be oscillatory if:

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Correct answer: (C) R² < 4L/C

1 marks · 2024 · Set E

Question 123

In a simple circuit containing inductance L and resistance R, with steady current I₀, the rate of increase of current is:

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Correct answer: (B) Proportional to R/L

1 marks · 2024 · Set E

Question 124

Alternating current or voltage can be generated by:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 125

A parallel LC circuit works as a rejector for frequency fᵣ. Then fᵣ =

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Correct answer: (A) 1/(2π√LC)

1 marks · 2024 · Set E

Question 126

The form factor in an AC circuit is:

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Correct answer: (A) The ratio of RMS to average value

1 marks · 2024 · Set E

Question 127

For a convex mirror:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 128

If v₁ and v₂ are the velocities of light in media 1 and 2 respectively, the refractive index of medium 2 with respect to medium 1 is:

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Correct answer: (A) v₁/v₂

1 marks · 2024 · Set E

Question 129

The laws of reflection are true for:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 130

If a prism is arranged at the position of minimum deviation, then:

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Correct answer: (C) Angle of incidence = angle of emergence

1 marks · 2024 · Set E

Question 131

In Rayleigh scattering, the wavelength of the incident light wave is:

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Correct answer: (B) Greater than the dimension of the particle

1 marks · 2024 · Set E

Question 132

In Young’s double-slit experiment, the distance between two successive fringes is:

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Correct answer: (C) Equal

1 marks · 2024 · Set E

Question 133

In the polarization of light, which property of light changes?

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 134

From Brewster’s law of polarization, it can be said that the angle of polarization depends on:

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Correct answer: (B) Refractive index of the medium

1 marks · 2024 · Set E

Question 135

A human body at its normal temperature:

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Correct answer: (B) Radiates most strongly in the infrared part of the spectrum

1 marks · 2024 · Set E

Question 136

The work function of a metal depends on:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 137

The momentum of a photon of frequency f is given by:

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Correct answer: (A) hf/c

1 marks · 2024 · Set E

Question 138

Bohr’s model can be applied to:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 139

The principal quantum number determines:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 140

In a hydrogen atom, the radius of the second Bohr orbit in terms of Bohr radius a₀ is:

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Correct answer: (C) 4a₀

1 marks · 2024 · Set E

Question 141

Plutonium (⁹⁴Pu²³⁹) is:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 142

Complete the nuclear process: ₆C¹¹ → ₅B¹¹ + β⁺ + ________.

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 143

Which element can be used to make a P-type semiconductor?

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Correct answer: (E) None of the above

1 marks · 2024 · Set E

Question 144

With increase in temperature, the resistivity of metals:

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Correct answer: (A) Increases

1 marks · 2024 · Set E

Question 145

In the rectification process:

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Correct answer: (A) AC voltage (or current) is converted into DC voltage (or current)

1 marks · 2024 · Set E

Question 146

Which of the following indicates forward bias of a diode?

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 147

In a common-base amplifier, the phase difference between the input and output voltages is:

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Correct answer: (C) 0

1 marks · 2024 · Set E

Question 148

In a common-emitter transistor amplifier, the transistor current gain is 100, input resistance rᵢ = 1 kΩ, and load resistance is 10 kΩ. What is the voltage gain of the amplifier?

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Correct answer: (B) 1000

1 marks · 2024 · Set E

Question 149

A NOR gate has two inputs A and B. Its output Y can be given as:

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Correct answer: (D) More than one of the above

1 marks · 2024 · Set E

Question 150

In a logic gate, when all inputs are one, the output is zero. The logic gate is:

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Correct answer: (A) A NAND gate

1 marks · 2024 · Set E

TRE3 — Language General Studies And Physics