CBSE 11TH PHYSICS - Online Test
Q1. A weight of 20kg falls from a height of 10 m. The work done by the gravitational force is (Take g = 10 m )
Answer : Option C
Explaination / Solution:
W=Fscosθ=mghcos0∘W=20×10×10×1=2000J
Q2. The major contribution of C.V. Raman was
Answer : Option A
Explaination / Solution:
The Indian physicist C.V. Raman helped the growth of science in his country. He received the Nobel Prize for Physics in 1930 for the discovery that when light passes through a transparent material, some of the light changes in wavelength. This phenomenon is now called Raman scattering.
Q3. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along
Answer : Option B
Explaination / Solution:
cular to both
and that is along the axis of rotation according to right hand screw rule.
Q4. A man in a lift is holding a can filled with water but having a hole in its bottom. When will the drainage of water be maximum?
Answer : Option B
Explaination / Solution:
No Explaination.
Q5.
A tank used for filling helium balloons has a volume of 0.300 and contains 2.00 mol of helium gas at 20.0. Assuming that the helium behaves like an ideal gas, What is the average kinetic energy per molecule?
Answer : Option B
Explaination / Solution:
E=32kT=32×1.38×10−23×293=6.07×10−21J
Q6. Find the wrong statement about specific heat of a material
Answer : Option A
Explaination / Solution:
extensive properties (i.e. mass) are dependent upon the amound of a substance, while intensive properties (i.e. density) are independent of quantity.
Q7. Approximately How many km is 3 m ?
Answer : Option B
Explaination / Solution:
1 km h-2 =
=>
=>
=>
Q8. A simple spring has length l and force constant K. It is cut into two springs of lengths and such that =n. (where n is an integer), the force constant of the spring of length is
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. A truck is coming towards you from a distance of 1000m on a straight road, at time t=0. It reaches you in 100sec. The average speed in m/s is
Answer : Option D
Explaination / Solution:
Total distance covered s = 1000 m
Total time taken t = 100-0 = 100 s
Average speed
Q10. There are three sources of sound of equal intensities with frequencies 400, 401 and 402 Hz. The number of beats per seconds is
Answer : Option B
Explaination / Solution:
No Explaination.
