CBSE 11TH PHYSICS - Online Test

Answer : Option A
Explaination / Solution:
No Explaination.

Answer : Option C
Explaination / Solution:

The Carnot cycle consists of the following four processes:

1. A reversible isothermal gas expansion process
2. A reversible adiabatic gas expansion process
3. A reversible isothermal gas compression process
4. A reversible adiabatic gas compression process

Answer : Option C
Explaination / Solution:

Work done is positive when force applied and displacement are in same direction.

W=F⃗ .s⃗ =Fscosθ

in this case angle between force and displacement is zero (i.e. cosθ=1) so that work done is positive.

Answer : Option B
Explaination / Solution:

Weight of the stone is balanced by the reaction of the floor. The only acceleration is provided by the horizontal motion of the train.

a = 1ms-2

force in horizontal direction 

F = ma = 0.1 x 1 = 0.1N

Answer : Option A
Explaination / Solution:

Technology is the making, modification, usage, and knowledge of tools, machines, techniques, crafts, systems, and methods of organization, in order to solve a problem, improve a pre-existing solution to a problem, achieve a goal, handle an applied input/output relation or perform a specific function. It can also refer to the collection of such tools, including machinery, modifications, arrangements and procedures.

Answer : Option D
Explaination / Solution:

L⃗ =r⃗ ×p⃗ =m(r⃗ ×v⃗ )

Hence direction of angular momentum L⃗  is perpendicular to both r⃗  and v⃗  that is perpendicular to the orbital plane.

Answer : Option C
Explaination / Solution:

The answer lies in the surface tension of the water, As the cohesive forces between the molecules is responsible for the surface tension. When the molecules on the glass or container do not have a surface to stick to, they cohere more strongly to the molecules they are associated with. Since the molecules on top have no neighbours on the top to cohere to, they associate with their other neighbours more strongly. This creates a strong bond between the top layer of molecules. The molecules inward face no net force because they all cancel out each other. However, the surface molecules face a net inward force because there is no force for them on the surface to cancel it. This causes the molecules on the surface to 'contract' and resist being broken or stretched.

Answer : Option D
Explaination / Solution:

E=32kT=32×1.38×10−23×600=1.24×10−19J

k = boltzman constant

Answer : Option B
Explaination / Solution:

TC−0100−0=TK−273.15373.15−273.15

Answer : Option D
Explaination / Solution:

Side of cube (a) = 2 cm  = 2×10−2m

Volume of cube (V) = a3=(2×10−2)3

= 8.0×10−6m3