NEET Physics: Questions 423 - 427 of 2098

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Question number: 423

» Electrostatics » Electric Charges

Assertion-Reason▾

Assertion (Ꭺ)

Electrons move away from a low potential to high potential region.

Reason (Ꭱ)

because electrons have negative charge

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

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

Question number: 424

» Electrostatics » Capacitors

MCQ▾

Question

Two capacitors of capacitances 3µF and 6µFare charged to a potential of 12V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be

Choices

Choice (4) Response

a.

6 volt

b.

zero

c.

4 volt

d.

3 volt

Question number: 425

» Electrostatics » Torque on a Dipole in a Uniform Electric Field.

MCQ▾

Question

Electric charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is

Choices

Choice (4) Response

a.

3ql

b.

2ql

c.

4q l

d.

ql

Question number: 426

» Communication System » Bandwidth of Signals

MCQ▾

Question

In an experiment for measurement of young’s modulus, following readings are taken. Load = 3.00 kg, length = 2.820 m, diameter - 0.041 cm and extension = 0.87. Determine the percentage error in the measurement of Y.

Choices

Choice (4) Response

a.

+ 15%

b.

+ 6.5%

c.

+ 5%

d.

+ 5.5%

Question number: 427

» Laws of Motion » Force and Inertia

MCQ▾

Question

particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k 2 rt 2, where k is a constant. The power delivered to the particle by the force acting on it will be

Choices

Choice (4) Response

a.

mk 2 t 2 r

b.

mk 2 t 2 r 2

c.

mk 2 r 2 t

d.

m 2 k 2 t 2 r 2

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