Physics Test

Result

Physics Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

A transparent solid cylindrical rod has a refractive index of 2/√3. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure.The incident angle θ for which the light ray grazes along the wall of the rod is

A

Sin ^-1 (√3/2)

B

Sin ^-1 (1/√3)

C

Sin ^-1 (2/√3)

D

Sin ^-1 (1/2)
Question 2
1 / -0

In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree(=0.5 deg), then the least count of the instrument is

A

one minute

B

one degree

C

half minute

D

half degree
Question 3
1 / -0

A thin rod of length ‘L’ is lying along the x-axis with its ends at x = 0 and x = L. Its linear density (mass/length) varies with x as k (X/L)^n , where n can be zero or any positive number. If the position x-CM of the centre of mass of the rod is plotted against ‘n’, which of the following graphs best approximates the dependence of x-CM on n?

A

Option 1

B

Option 2

C

Option 3

D

Option 4
Question 4
1 / -0

Directions: Two moles of helium gas are taken over the cycle ABCDA, as shown in the P – T diagram. Question : The net work done on the gas in the cycle ABCDA is

A

Zero

B

1904 R

C

1076 R

D

276 R
Question 5
1 / -0

The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions: (i) A + B → C + ε (ii) C → A + B + ε (iii) D + E → F + ε and (iv) F → D + E + ε where ε is the energy released? In which reactions is ε positive?

A

(i) and (iii)

B

(ii) and (iv)

C

(i) and (iv)

D

(ii) and (iii)
Question 6
1 / -0

The height at which the acceleration due to gravity becomes g/9 (where g = the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth is

A

2R

B

R/2

C

R/√2

D

√2R
Question 7
1 / -0

Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see in figure). Question : If a strong diffraction peak is observed when electrons are incident at an angle ‘i’ from the normal to the crystal planes with distance ‘d’ between them (see figure), de Broglie wavelength λdB of electrons can be calculated by the relationship (n is an integer)

A

d cos i = nλdB

B

2d cos i = nλdB

C

2d sin i = nλdB

D

d sin i = nλdB
Question 8
1 / -0

This question contains Statement -1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion. andStatement – II : For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z.

A

Statement – 1 is false, Statement – 2 is true.

B

Statement – 1 is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

C

Statement – 1 is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.

D

Statement – 1 is true, Statement – 2 is False.
Question 9
1 / -0

A block of mass 0.50 kg is moving with a speed of 2.00 m/s on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

A

0.67 J

B

0.16 J

C

0.34 J

D

1.00 J
Question 10
1 / -0

Two points P and Q are maintained at the potentials of 10V and -4V respectively. The work done in moving 100 electrons from P to Q is

A

2.24 x 10^-16 J

B

-2.24 x 10^-16 J

C

-19 × 10^-17 J

D

9.60 × 10^-17 J