Physics Test 208

Result

Physics Test 208

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Weekly Quiz Competition

Question 1
4 / -1

In a hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5 × 10⁻¹¹ m. Its time period is 1.5 × 10⁻¹⁶s. The current associated with the electron motion is (charge of electron is 1.6 × 10⁻¹⁹ C)

A
1.066 × 10⁻³ A

B
1.66 × 10⁻³ A

C
1.00 A

D
1.81 × 10⁻³ A

Solution
Question 2
4 / -1

A cubical vessel open from top of side L is filled with a liquid of density ρ then the torque of hydrostatic force on a side wall about an axis passing through one of bottom edges is-

A

B

C

D

Solution
Question 3
4 / -1

A certain ideal gas undergoes a polytropic process PV ⁿ = constant such that the molar specific heat during the process is negative. If the ratio of the specific heats of the gas be γ, then the range of values of n will be

A

B

C

D

Solution
Question 4
4 / -1

A ball is projected from the bottom of an inclined plane of inclination 30^o, with a velocity of 30 m s⁻¹, at an angle of 30^o with the inclined plane. If g = 10 ms⁻², then the range of the ball on given inclined plane is

A
12 m

B
60 m

C
30 m

D
600 m

Solution
Question 5
4 / -1

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be

A
f/2

B
f/4

C
8f

D

Solution
Question 6
4 / -1

If the radius of the earth were to shrink by one percent and its mass remains the same, the acceleration due to gravity on the earth's surface would

A
Decrease

B
Remain unchanged

C
Increase

D
Become zero

Solution
Question 7
4 / -1

A black body, at 200 K, is found to have maximum energy at a wavelength of 14 μm. When its temperature is raised to 1000 K, the wavelength at which maximum energy is emitted is

A
14 μm

B
70 μm

C
2.8 μm

D
2.8 mm

Solution
Question 8
4 / -1

The time constant of charging of the capacitor shown in the diagram is

A
2/3 RC

B
2 RC

C
3 RC

D
3/2 RC

Solution

The given circuit is equivalent to two simple circuits connected in parallel with the battery as shown below.
Question 9
4 / -1

Spherical wavefronts shown in figure, strike a plane mirror. Reflected wavefronts will be as shown in

A

B

C

D

Solution

According to Huygens principle, ray of light will be normal to the wavefront.
Question 10
4 / -1

A simple pendulum has a time period T₁ when on the earth's surface and T₂ when taken to a height 2R above the earth's surface where R is the radius of the earth. The value of

A
1/3

B
√3

C
9

D
3

Solution