AIIMS Physics: Questions 257 - 261 of 500

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Question number: 257

» Oscillations and Waves » Wave Motion

Appeared in Year: 2000

Assertion-Reason▾

Assertion (Ꭺ)

Like sound, light cannot propagate in vacuum.

Reason (Ꭱ)

Sound is a square wave. It propagates in a medium by virtue of damping oscillation.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 258

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

A capacitor of capacitance 3µF is connected in the tank circuit of an oscillator oscillating with a frequency of 2 kHz. If the current flowing in the circuit is 5 mA, the voltage across the capacitor will be –

Choices

Choice (4) Response

a.

0.133 V

b.

0.165 V

c.

81.5 V

d.

159 V

Question number: 259

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

The current passing through a choke coil of 12 H is decreasing at the rate of 1amperesecond . The emf developing across the coil is –

Choices

Choice (4) Response

a.

6 V

b.

– 6 V

c.

12 V

d.

– 12 V

Question number: 260

» Kinematics » Projectile Motion

MCQ▾

Question

The velocity of projection of an oblique projectile is (5i^+12j^)ms. The horizontal range of the projectile is –

Choices

Choice (4) Response

a.

10m

b.

15m

c.

12m

d.

4.9m

Question number: 261

» Electrostatics » Conductors and Insulators

MCQ▾

Question

A conducting sphere of radius 20 cm is charged with 30µC . Another uncharged sphere of radius 60 cm is allowed to touch it for some time. After that if the sphere are separated, then surface density of charged on the spheres will be in the ratio of:

Choices

Choice (4) Response

a.

1: 3

b.

3: 1

c.

1: 2

d.

2: 1

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