Physics Test

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Physics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

If a satellite is orbiting the earth very close to its surface, then the orbital velocity mainly depends on

A
The mass of the satellite only

B
The radius of the earth only

C
The radius of the earth only

D
The mass of the earth only
Question 2
1 / -0

A force of 750 N is applied to a block of mass 102 kg to prevent it form sliding on a plane with an inclination angle 30° with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is

A
750 N

B
500 N

C
345 N

D
250 N

Solution

Solution
Question 3
1 / -0

In thermal equilibrium, the average velocity of gas molecules is

A
Proportional to √T

B
Proportional to T²

C
Proportional to T³

D
Zero
Question 4
1 / -0

A body, whose momentum is constant, must have constant

A
force

B
velocity

C
angular acceleration

D
angular momentum

Solution

Solution

A body whose momentum is constant must have constant velocity.

For a given mass, the velocity remains constant if the momentum is constant.

This is because momentum = mass × velocity.

So, momentum is directly proportional to velocity.

Hence option B) is correct
Question 5
1 / -0

On increasing the temperature of a substance gradually, which of the following colours will be noticed by you

A
White

B
Yellow

C
Green

D
Red
Question 6
1 / -0

A straight conductor carrying current I. If the magnetic field at a distance r is 0.4 tesla, then magnetic field at a distance 2r will be

A
0.4 tesla

B
0.1 tesla

C
0.8 tesla

D
0.2 tesla
Question 7
1 / -0

A river water is flowing at 5ms −1. The depth of river water is 10m. The shearing stress between horizontal layers of the river water is (Viscosity of water is 1 decapoise)

A
1 x 10⁻³ N−m⁻²

B
0.5 x 10⁻³ Nm^-1

C
2.5 x 10⁻³ N−m⁻²

D
7.5 x 10⁻³ N−m⁻²

Solution

Solution
Question 8
1 / -0

A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. If the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth's magnetic field = B H)

A
0

B
2B_H

C

D
Question 9
1 / -0

A stone is dropped into a lake from a tower of 500 m height. The sound of splash will be heard after (Take g = 10 m-s^⁻2)

A
10 s

B
11.5 s

C
14 s

D
21 s

Solution

Solution

We know that

s = ut +1 /2 at2

here

u = 0

a = g

s = 500m

so putting value in above equation

we get

t = 10s

Now

Velocity of sound in air 332m/s

time of sound travel = (t1 - 10)sec

Distance= sound x time

500 = 332 x (t1 -10)

t1 = 11.5 sec
Question 10
1 / -0

Which of the following statement is false?

A
mass, speed and energy are scalar quantities

B
momentum, force and torque are vector quantities

C
distance is a scalar quantity but displacement is a vector quantity

D
a vector has only magnitude, whereas a scalar has both magnitude and direction

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Re-Attempt Weekly Quiz Competition

Physics Test - 2

Result

Physics Test - 2

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SHARING IS CARING

Question 1

The mass of the satellite only

The radius of the earth only

The radius of the earth only

The mass of the earth only

Question 2

750 N

500 N

345 N

250 N

Solution

Question 3

Proportional to √T

Proportional to T2

Proportional to T3

Zero

Question 4

force

velocity

angular acceleration

angular momentum

Solution

Question 5

White

Yellow

Green

Red

Question 6

0.4 tesla

0.1 tesla

0.8 tesla

0.2 tesla

Question 7

1 x 10⁻3 N−m⁻2

0.5 x 10⁻3 Nm-1

2.5 x 10⁻3 N−m⁻2

7.5 x 10⁻3 N−m⁻2

Solution

Question 8

0

2BH

Question 9

10 s

11.5 s

14 s

21 s

Solution

Question 10

mass, speed and energy are scalar quantities

momentum, force and torque are vector quantities

distance is a scalar quantity but displacement is a vector quantity

a vector has only magnitude, whereas a scalar has both magnitude and direction

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Proportional to T²

Proportional to T³

1 x 10⁻³ N−m⁻²

0.5 x 10⁻³ Nm^-1

2.5 x 10⁻³ N−m⁻²

7.5 x 10⁻³ N−m⁻²

2B_H