Physics Test 155

Result

Physics Test 155

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Weekly Quiz Competition

Question 1
4 / -1

Assume that you are facing south direction at a time when the sun is just setting. The scattered light that comes to you is polarized such that electric field is oscillating in a plane which is

A
Horizontal with electric field along vertical direction.

B
Vertical with electric field along east west direction.

C
Vertical with electric field along vertical direction.

D
Horizontal with electric field along east west direction.
Question 2
4 / -1

Three rods of the same length and the same area of cross - section are joined. The temperature of two ends are T₁ and T₂ as shown in the figure.

As we move along the rod the variation in temperature is as shown in the following graph [Rods are insulated from the surrounding except at the end faces]

A

B

C

D

Solution
Question 3
4 / -1

A uniform disc of mass M and radius R is supported vertically by a pivot at its periphery as shown. A particle of mass M is fixed to the rim and raised to the highest point above the centre. The system is released from rest and it can rotate about pivot freely. The axis of rotation is horizontal and perpendicular to the plane of paper. The angular speed of the system when the attached object is directly beneath the pivot, is

A

B

C

D

Solution
Question 4
4 / -1

1 mole of a monoatomic gas undergoes the process PT = constant. Then the molar heat capacity of the gas during the process will be equal to :

A
4R

B
2.5R

C
3.5 R

D
8R/3

Solution
Question 5
4 / -1

The temperature of a mono-atomic gas in an uniform container of length 'L' varies linearly from T₀ to T_L as shown in the figure. If the molecular weight of the gas is M, then the time taken by a wave pulse in traveling from end A to end B is

A

B

C

D

Solution
Question 6
4 / -1

Two sources of sound placed close to each other, are emitting progressive waves given by An observer located near these two sources of sound will hear

A
4 beats per second with intensity ratio 25 : 16 between waxing and waning.

B
8 beats per second with intensity ratio 25 : 16 between waxing and waning.

C
8 beats per second with intensity ratio 81 : 1 between waxing and waning.

D
4 beats per second with intensity ratio 81 : 1 between waxing and waning.

Solution
Question 7
4 / -1

A spring of mass M and force constant K in form of a circular loop performing oscillations moving radially in and out in free space keeping its center at rest. Time period of oscillation is given by (Assume cross sectional radius of spring is very small than radius of spring loop)

A

B

C

D

Solution

Let natural radius of loop is R and at any instant radius is r then mechanical energy of loop is
Question 8
4 / -1

A capacitor is to be designed to operate, with constant capacitance, in an environment of fluctuating temperature (less than 5%). As shown in the figure, the capacitor is a parallel plate capacitor with 'spacer' to change the distance for compensation of temperature effect. If α₁ be the co-efficient of linear expansion of plates and α₂ that of spacer, the condition for no change in capacitance with change of temperature is (The capacitance of the capacitor is equal to C and spacer have insulated ends). The dielectric constant of spacer is 1.

A

B

C

D

Solution
Question 9
4 / -1

A capacitor is being discharged by infinite ladder of resistors, starting from Q₀ charge. Total heat dissipated in horizontal resistors is

A

B

C

D

Solution
Question 10
4 / -1

A large flat metal surface has a uniform charge density (+σ). An electron of mass m and charge e leaves the surface at the point A with speed u and returns to it at point B. Disregarding gravity, the maximum value of AB is

A

B

C

D

Solution