Physics Test 156

Result

Physics Test 156

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Question 1
4 / -1

Let A_n be the area enclosed by the n^th orbit in a hydrogen atom. The graph of ℓn (A_n / A₁) against ℓn (n)

A
Will not pass through the origin

B
Will have certain points lying on a straight line with slope 4

C
Will be a monotonically increasing non linear curve

D
Will be a circle

Solution
Question 2
4 / -1

An uniform ring of radius R, is fitted with a massless rod AB along its diameter. An ideal horizontal string (whose one end is attached with the rod at a height r) passes over a smooth pulley and other end of the string is attached with a block of mass double the mass of ring as shown. The co-efficient of friction between the ring and the surface is µ. When the system is released from rest, the ring moves such that rod AB remains vertical. The value of r is

A

B

C

D

Solution
Question 3
4 / -1

The antenna current of an AM broadcast transmitter which is modulated by 50% is 11 A. The carrier current is

A
9.25 A

B
22 A

C
10.35 A

D
5.5 A

Solution
Question 4
4 / -1

An object moves with a uniform velocity u₀ along the axis of a concave spherical mirror. Consider the instant shown in diagram, object is moving with u₀ = 5 m/s and f = –10 cm. If object is at the centre of curvature at this instant, then the magnitude of acceleration of image at this instant is a m/s². Find a.

A
5

B
10

C
25

D
None of these

Solution
Question 5
4 / -1

Only thin film shows interference because

A
In thick film, light is absorbed in large amount.

B
In thick film, condition of coherence is not met.

C
In thick film, interference is not for visible wavelengths.

D
Light get scattered by thick film.
Question 6
4 / -1

Directions For Questions

A plank is on a smooth horizontal ground. A man is standing at one end of plank as shown in figure. Whole system is initially at rest. When man starts walking without slipping :

Consider the following statements:

i.   Friction between man and plank is static.

ii.   Friction between man and plank is kinetic.

iii.  Net work done by friction on system (man + plank) is 0.

iv.  Work done by friction on man is positive

v. Work done by friction on man is negative

vi.  Work done by friction on plank is positive

vii. Work done by friction on plank is negative

...view full instructions

Which of the above statements are correct?

A
i, iii, iv, vii

B
i, iv, vi

C
i, iii, v, vi

D
ii, v, vi
Question 7
4 / -1

A curved portion of radius of curvature R is cut from a uniformly charged non–conducting sphere of radius R having charge density ρ as shown in figure. Find electric field at point P lying symmetrically w.r.t the ends.

A

B

C

D

Solution
Question 8
4 / -1

The switch in the circuit below is open. The capacitor of capacitance 2C carries electric charge q₀. The capacitor of capacitance C is uncharged and there is no electric current in the inductor. Find the value of the maximum current through the switch after it is closed.

A

B

C

D

Solution
Question 9
4 / -1

A thin elastic loop of natural length ℓ is kept slightly on a water film in gravity free space and inner film of loop is bursted keeping outer film intact. If force constant of loop is k and loop follow hooke's law, then radius of loop in equilibrium is (Surface Tension of water is S)

A

B

C

D

Solution
Question 10
4 / -1

, F = Force, k = Boltzmann constant, t = temperature, x = distance. The dimensions of β is

A

B

C

D

Solution