Physics Test

Result

Physics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The time periode of simple pendulum measured inside a stationary lift is found to be T. If the lift starts acclerating upwards with an acceleration g/3, the time periode is

A
T √3

B
T √3/2

C
4T/3

D
T/3

Solution

Solution

We know that for a pendulum, its time period T = 2√L/g

Where L is the length of the pendulum and g is net acceleration.

As the lift goes up with the acceleration g/3 we get in frame of the lift, net acceleration is 4g/3

Thus we get new time period, T’ = 2√3L/4g = 3√T / 2
Question 2
1 / -0

Identify the correct statement among the following

A
A simple pendulum with a bob of mass M swings with an angular amplitude of 40° When its angular amplitude is 20°, then tension in the string is less than Mg cos 20°

B
The greater the mass of a pendulum bob, the shorter is its frequency of oscillation

C
The fractional change in the time period of a pendulum on changing the temperature is independent of the length of the pendulum

D
As the length of a simple pendulum is increased, the maximum velocity of its bob during its oscillation will also increase

Solution

Solution

(A) Tension in the string at θ = 20° is

This statement is wrong.

(B) Time period is independent of mass of bob

∴ option (B) is wrong

This is independent of length

So it is a correct statement

∴ option (D) is wrong
Question 3
1 / -0

A stone thrown at an angle θ to the horizontal reaches a maximum height h. The time of flight of the stone is

A
√2h sin θ/g

B
2√2h sin θ/g

C
2√2h/g

D
√2h/g
Question 4
1 / -0

The rise of liquid in a capillary tube has a meniscus. If the angle of contact is 90°, the shape of the meniscus is

A
concave

B
convex

C
flat

D
none of the above
Question 5
1 / -0

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be

A
10 cm

B
15 cm

C
20 cm

D
30 cm

Solution

Solution
Question 6
1 / -0

A wheel is rotating at 900 r.p.m. about its axis When power is cut off it comes to rest in 1 minute The angular retardation in rad/s² is

A
π/2

B
π/4

C
π/6

D
π/8
Question 7
1 / -0

A boat is sent across a river with a velocity of 8 km/h. If the resultant velocity of the boat is 10 km/h, the river is flowing with a velocity of

A
12.8 km/h

B
6 km/h

C
8 km/h

D
10 km/h

Solution

Solution
Question 8
1 / -0

The rise of liquid due to surface tension in a narrow capillary tube of diameter 'd' is 'h'. If the diameter is reduced to d/2 , the rise will be

A
h

B
2h

C
h/2

D
h/3
Question 9
1 / -0

A silver voltameter of resistance 2 ohm and a 3 ohm resistor are connected in series across a cell. If a resistance of 2 ohm is connected in parallel with the voltameter, then the rate of deposition of silver

A
Decreases by 25%

B
Increases by 25%

C
Increases by 37.5%

D
Decreasese by 37.5%
Question 10
1 / -0

The temperature at which the reading of a Fahrenheit thermometer will be double that of a centigrade thermometer is

A
100°C

B
180°C

C
32°C

D
160°C