Physics Test

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Physics Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

γ-ray emission :

A

Energy production in stars via hydrogen conversion to helium

B

Heavy water

C

Both Energy production in stars via hydrogen conversion to helium and Heavy water

D

Neither Energy production in stars via hydrogen conversion to helium nor Heavy water
Question 2
1 / -0

Consider a hydrogen atom with its electron in the n-th orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc = 1242 eV nm)

A

4

B

3

C

1

D

2
Question 3
1 / -0

A battery of e.m.f. E has an internal resistance 'r'. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. lf R alone is gradually reduced to zero, which of the following best describes I and V?

A

I approaches infinity, V approaches E

B

I approaches zero, V approaches E

C

I approaches E / r, V approaches zero

D

I approaches E / r, V approaches E
Question 4
1 / -0

Nuclear fusion :

A

Energy production in stars via hydrogen conversion to helium and Neutrino emission

B

Energy production in stars via hydrogen conversion to helium

C

Neutrino emission

D

Heavy water
Question 5
1 / -0

In the following circuit, the current through the resistor R (=2Ω) is I Amperes. The value of I is

A

5

B

2

C

3

D

1
Question 6
1 / -0

A container of fixed volume has a mixture of one mole of hydrogen and one mole of helium in equilibrium at temperature T. Assuming the gases are ideal, the correct statement(s) is(are)

A

All of these

B

The average energy per mole of the gas mixture is 2RT.

C

The ratio of speed of sound in the gas mixture to that in helium gas is √(6/5)

D

The ratio of the rms speed of helium atoms to that of hydrogen molecules is 1/√2.
Question 7
1 / -0

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r < R), then the correct option(s) is(are)

A

[P(r = 3R / 4)]/[P(r = 2R / 3)] = 63/80

B

P(r = 0) = 0

C

None of these

D

[P(r = R / 2)]/[P(r = R / 3)] = 20/ 27
Question 8
1 / -0

Two independent harmonic oscillators of equal mass are oscillating about the origin with angular frequencies ω1 and ω2 and have total energies E1 and E2, respectively. The variations of their momenta p with positions x are shown in the figures. If a/b = n^2 and a/R = n, then the correct equation(s) is(are)

A

ω1 ω2 = n^2

B

E1 ω1= E2 ω2

C

ω2/ω1 = n^2

D

All of these
Question 9
1 / -0

A

All of these

B

Option B

C

Option C

D

Option A
Question 10
1 / -0

A monochromatic beam of light is incident at 60 deg on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal (see the figure). For n = √3 the value of θ is 60 deg and dθ/dn = m. The value of m is

A

2

B

1

C

3

D

4