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### Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively

Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively. If initially they have the same number of nuclei, then the ratio of number of nuclei of X₁ to that of X₂ […]

### A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction 1/π (Wb / m²) in such a way that its axis makes an angle of 60⁰ with B⃗. The […]

### The wave described by y = 0.25 sin (10 2πx – 2πt), where x and y are in meters

The wave described by y = 0.25 sin (10 2πx – 2πt), where x and y are in meters and t in second is a wave travelling along the:

Options

(a) negative x […]

### If Q, E and W denote respectively the heat added, change in internal energy

If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then:

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(a) W = 0 (b) Q = W […]

### The energy required to charge a parallel plate condenser of plate separation d

The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is

Options

(a) ε₀E² […]

### The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v

The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ volts. The electric field at that point is

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(a) 4π?￢ﾂﾀQ x 10²² volt/m […]

### The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

Options

(a) 1.25 (b) 100 (c) 90 (d) 10

100

Explanation:

One […]

### The voltage gain of an amplifier with 9% negative feedback is 10.

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

Options

(a) 90 (b) 10 (c) 1.25 (d) 100

100

Explanation:

Negative […]

### A p-n photodiode is made of a material with a band gap of 2.0 eV

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

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(a) 10 […]

### A long solenoid has 500 turns. When a current of 2 ampere is passed through it

A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4×10⁻³ Wb. The self-inductance of the solenoid […]

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