Physics Test 144

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Physics Test 144

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Weekly Quiz Competition

Question 1
4 / -1

The circuit has two oppositively connected ideal diodes in parallel. The current flowing in the circuit is

A
1.71A

B
2.00A

C
2.31A

D
1.33A

Solution
Question 2
4 / -1

Degree of modulation

A
can take any value

B
should be less than 100%

C
should exceed 100%

D
exactly 100%
Question 3
4 / -1

A student measured the length of a rod as 3.50 cm. Which instrument did he used to measure it?

A
A meter scales

B
A Vernier caliper where the 10 divisions in Vernier scale matches with 9 divisions in main scale and main scale has 10 divisions in 1 cm

C
A screw gauge having 100 divisions in the circular scale and pitch as 1 mm

D
A screw gauge having 50 divisions in the circular scale and pitch as 1 mm

Solution

Measured length of rod = 3.50 cm

For Vernier scale with 1 Main Scale Division = 1 mm

9 Main Scale Division = 10 Vernier Scale Division,

Least count = 1 MSD –1 VSD = 0.1 mm
Question 4
4 / -1

Two trains each of 50 m long are moving parallel towards each other at speeds 10 m/s and 15 m/s respectively. After what time will they pass each other?

A

B
4 sec

C
2 sec

D
6 sec

Solution

Relative speed of trains with respect to each other be, v = 10 + 15 = 25 m/s

Here distance covered by each train = sum of their lengths = 50 + 50 = 100 m
Question 5
4 / -1

A

B

C

D

Solution
Question 6
4 / -1

Which of the following phenomena does not at all involve air viscosity?

A
When a meteorite enters the earth's atmosphere, it burns up.

B
Raindrops that fall from tremendous heights go to the ground at a comparatively slow speed.

C
A ball spinning through air can move sideways

D
At various points in air moving through a tube with a different cross section, the pressure changes.

Solution

At various points in air moving through a tube with a different cross section, the pressure changes.

The change in pressure with velocity is due to Bernoulli's principle, and is not affected by viscosity.
Question 7
4 / -1

When a charge is placed on the axis of a dipole, it exerts a force of F; however, if the charge is moved twice as far, the force will be ________.

A
zero

B
F/2

C
F/4

D
F/8

Solution
Question 8
4 / -1

When connected in series or parallel, three identical cells with an exterior resistance of 2Ω and an internal resistance of 2 V each send the same current. Following that, the magnitude of current passing through the external resistance is

A
0.75 A

B
1 A

C
1.5 A

D
zero

Solution
Question 9
4 / -1

Two condensers of capacities 2C and C are joined in parallel and charged up to potential V. The battery is removed and the condenser of capacity C is filled completely with a medium of dielectric constant K. The p.d. across the capacitor will now be-

A

B

C

D

Solution
Question 10
4 / -1

the breaking stress of a wire is depending on,

A
material of wire

B
length of wire

C
Radius of the wire

D
Shape of cross section

Solution

Material of wire

Stress is the force exerted by the material in response to the applied force and the amount of the force which is depends on the material of which is made.