Physics Test 237

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Physics Test 237

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Weekly Quiz Competition

Question 1
4 / -1

Assertion : According to classical theory, the proposed path of an electron in Rutherford atom model will be parabolic.

Reason : According to electromagnetic theory an accelerated particle continuously emits radiation.

A
If both assertion and reason are true and the reason is the explanation of the assertion.

B
If both assertion and reason are true but reason is not the explanation of the assertion.

C
If assertion is true but reason is false.

D
If assertion is false but reason is true.

Solution

According to classical electromagnetic theory, an accelerated charge continuously emits radiation. As electrons revolving in circular paths are constantly experiencing centripetal acceleration, hence they will be losing their energy continuously and the orbital radius will go on decreasing and form spiral and finally the electron will fall on the nucleus.
Question 2
4 / -1

A conducting wire has length L₁ and diameter d₁. After stretching the same wire length becomes L₂ and diameter d₂. The ratio of resistances before and after stretching is

A

B

C

D

Solution

Resistance of body is directly proportional to length and resistivity of material & inversely proportional to its cross-sectional area.
Question 3
4 / -1

The figure above shows graphs of pressure versus density for an ideal gas at two temperatures T₁ and T₂. Then,

A
T₁> T₂

B
T₁ = T₂

C
T₁ < T₂

D
any three is possible

Solution

The expression for the density of a gas is

Thus, for a given density, when the temperature is higher, the pressure is also higher.

Hence, T₁> T₂

Hence, the correct option is A
Question 4
4 / -1

In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance of 5Ω, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.

A
0.5Ω

B
0.6Ω

C
1.2Ω

D
1.5Ω

Solution
Question 5
4 / -1

The V-I graph for conductor at temperatures T₁ and T₂ are shown in the figure. (T₂− T₁) is proportional to :

A
cos 2θ

B
sin 2θ

C
cot 2θ

D
tan 2θ

Solution
Question 6
4 / -1

A cylindrical conductor has uniform cross section. Resistivity of its material increases linearly from left end to right end. If a constant current is flowing through it and at a section of distance x from left end, then magnitude of electric field intensity is E. Which of the following graphs is correct?

A

B

C

D

Solution
Question 7
4 / -1

The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)

A

B

C

D

Solution
Question 8
4 / -1

A coil of 100 turns and 5 square centimeter is placed in a magnetic field B = 0.2 T. The normal to the plane of the coil makes an angle of 60 with the direction of the magnetic field. The magnetic flux linked with the coil is :

A
5 x 10⁻³ Wb

B
5 x 10⁻⁵ Wb

C
10⁻² Wb

D
10⁻⁴ Wb

Solution
Question 9
4 / -1

In an electromagnetic wave, the amplitude of electric field is 1V/m, the frequency wave is 5 × 10¹⁴Hz. The wave is propagating along z-axis. The average energy density of electric field, in Joule/m, will be

A
1.1 × 10⁻¹¹

B
2.2 × 10⁻¹²

C
3.3 × 10⁻¹³

D
4.4 × 10⁻¹⁴

Solution
Question 10
4 / -1

A tank is filled with water up to height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water as shown in the figure. Express the horizontal distance x in terms of H and D :

A

B

C

D

Solution