Physics Test 64

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Physics Test 64

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Weekly Quiz Competition

Question 1
4 / -1

Air of density 1.2 kg m^–3 is blowing across the horizontal wings of an aero plane in such a way that its speeds above and below the wings are 150 ms^–1 and 100 ms^–1, respectively. The pressure difference between the upper and lower sides of the wings, is:

A
60 Nm^–2

B
180 Nm^–2

C
7500 Nm^–2

D
12500 Nm^–2
Question 2
4 / -1

This question has Statement–1 and Statement–2. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement 1: In Young’s double slit experiment, the number of fringes observed in the field of view is small with longer wave length of light and is large with shorter wave length of light.

Statement 2: In the double slit experiment the fringe width depends directly on the wave length of light.

A
Statement 1 is true, Statement 2 is true and the Statement 2 is not the correct explanation of the Statement 1.

B
Statement 1 is false and the Statement 2 is true

C
Statement 1 is true and Statement 2 is true and the Statement 2 is true explanation of the Statement 1

D
Statement 1 is true and the Statement 2 is false
Question 3
4 / -1

Two lenses of power –15D and +5D are in contact with each other. The focal length of the combination is

A
– 20 cm

B
– 10 cm

C
+ 20 cm

D
+ 10 cm
Question 4
4 / -1

In a series L-C-R circuit, C = 10^–11 Farad, L = 10^–5 Henry and R = 100 Ohm, when a constant D.C voltage E is applied to the circuit, the capacitor acquires a charge 10^–9 C. The D.C. source is replaced by a sinusoidal voltage source in which the peak voltage E₀ is equal to the constant D.C. voltage E. At resonance the peak value of the charge acquired by the capacitor will be:

A
10^–15 C

B
10^–6 C

C
10^–10 C

D
10^–8 C
Question 5
4 / -1

A point charge of magnitude +1 𝜇C is fixed at (0,0,0). An isolated uncharged spherical conductor, is fixed with its center at (4,0,0). The potential and the induced electric field at the center of the sphere is:

A
1.8 × 10⁵ V and –5.625 × 10⁶ V/m

B
0 V and 0 V/m

C
2.25 × 10⁶ and –5.625 × 10² V/m

D
2.25 × 10⁵ V and 0 V/m
Question 6
4 / -1

A uniform wire (Young’s modulus 2 × 10¹¹ Nm^–2) is subjected to longitudinal tensile stress of 5 × 10⁷ Nm^–2. If the overall volume change in the wire is 0.02 %, the fractional decrease in the radius of the wire is close to:

A
1.0 × 10^–4

B
1.5 × 10^–4

C
0.25 × 10^–4

D
5 × 10^–4
Question 7
4 / -1

The half-life of a radioactive element A is the same as the mean-life of another radioactive element B. Initially both substances have the same number of atoms, then:

A
A and B both decay at the same rate always

B
A and B will decay at the same rate mutually

C
A will decay at a faster rate than B initially

D
B will decay at a faster rate than A Mutually
Question 8
4 / -1

A ball projected from ground at an angle of 45° just clears a wall in front. If point of projection is 4m from the foot of wall and ball strikes the ground at a distance of 6m on the other side of the wall, the height of the wall is:

A
1.33 m

B
2.4 m

C
3.6 m

D
1.6 m
Question 9
4 / -1

An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with permittivity

ε = 4.0. Then

A
wavelength is doubled and the frequency remains unchanged.

B
wavelength is doubled and frequency becomes half.

C
wavelength is halved and frequency remains unchanged

D
wavelength and frequency both remain unchanged

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Re-Attempt Weekly Quiz Competition

Physics Test 64

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Physics Test 64

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SHARING IS CARING

Question 1

60 Nm–2

180 Nm–2

7500 Nm–2

12500 Nm–2

Question 2

Statement 1 is true, Statement 2 is true and the Statement 2 is not the correct explanation of the Statement 1.

Statement 1 is false and the Statement 2 is true

Statement 1 is true and Statement 2 is true and the Statement 2 is true explanation of the Statement 1

Statement 1 is true and the Statement 2 is false

Question 3

– 20 cm

– 10 cm

+ 20 cm

+ 10 cm

Question 4

10–15 C

10–6 C

10–10 C

10–8 C

Question 5

1.8 × 105 V and –5.625 × 106 V/m

0 V and 0 V/m

2.25 × 106 and –5.625 × 102 V/m

2.25 × 105 V and 0 V/m

Question 6

1.0 × 10–4

1.5 × 10–4

0.25 × 10–4

5 × 10–4

Question 7

A and B both decay at the same rate always

A and B will decay at the same rate mutually

A will decay at a faster rate than B initially

B will decay at a faster rate than A Mutually

Question 8

1.33 m

2.4 m

3.6 m

1.6 m

Question 9

wavelength is doubled and the frequency remains unchanged.

wavelength is doubled and frequency becomes half.

wavelength is halved and frequency remains unchanged

wavelength and frequency both remain unchanged

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60 Nm^–2

180 Nm^–2

7500 Nm^–2

12500 Nm^–2

10^–15 C

10^–6 C

10^–10 C

10^–8 C

1.8 × 10⁵ V and –5.625 × 10⁶ V/m

2.25 × 10⁶ and –5.625 × 10² V/m

2.25 × 10⁵ V and 0 V/m

1.0 × 10^–4

1.5 × 10^–4

0.25 × 10^–4

5 × 10^–4