NEET Physics: Questions 775 - 780 of 2099

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Question number: 775

» Work, Energy and Power » Work Done

MCQ▾

Question

A force F = (3 - 1x + 5x 2) N is applied on a 2 kg mass which displaces it from x = 0 to x = 2 m. Work done in joule is -

Choices

Choice (4) Response
a.

17.33

b.

13

c.

20.45

d.

7.55

Question number: 776

» Experimental Skills » Screw Gauge

MCQ▾

Question

2 bodies of different masses of 2 kg and 4 kg are moving with, velocities 20 m/s and 10 m/s towards each other due to mutual gravitational attraction. What is the velocity of their center of mass?

Choices

Choice (4) Response
a.

8 m/s

b.

6 m/s

c.

Zero

d.

5 m/s

Question number: 777

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

Energy stored in an inductor is proportional to (i= current in the inductor)

Choices

Choice (4) Response
a.

i

b.

i3

c.

i

d.

i2

Question number: 778

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

A resistor and a capacitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, applied voltage is,

Choices

Choice (4) Response
a.

12 V

b.

17 V

c.

13 V

d.

5 V

Question number: 779

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

If instantaneous current is given by i=4cos(ωt+ϕ) amperes, then the r. m. s value of current is

Choices

Choice (4) Response
a.

4 ampere

b.

22ampere

c.

zero ampere

d.

42ampere

Question number: 780

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

An alternating current does not show any magnetic effect.

Reason (Ꭱ)

Alternating current varies with time.

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

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