CBSE 11TH PHYSICS - Online Test

Answer : Option C
Explaination / Solution:

CV=12Rf

for diatomic gases f = 5

CV=52R

Answer : Option D
Explaination / Solution:

If temperature deformation is permitted to occur freely, no load or stress will beinduced in the structure. In some cases where temperature deformation is not permitted, an internal stress is created. The internal stress created is termed as thermal stress .

Answer : Option A
Explaination / Solution:

When two quantities are multiplied or divided, the relative error in the result is the sum of the relative errors in the multipliers.

e.g  x=a x b

maximum possible error is: Δxx=±(Δaa+Δbb)

similarly, for error in quotient: x= ab

maximum possible error is: Δxx=±(Δaa+Δbb)

Answer : Option B
Explaination / Solution:

The forces on the system is restoring force F=−kx   and the damping force is F=−bv=−bdxdt    where  'k' is the force constant and 'b' is the damping constant

The net force is F= m*a  which is equal to the sum of restoring force F=−kx   and the damping force is F=−bv=−bdxdt

md2xdt2=−kx−bdxdt∴md2xdt2+kx+bdxdt=0

Answer : Option D
Explaination / Solution:

Gravity supplies the necessary centripetal force to hold a satellite in orbit about the earth. Setting the gravity force from the universal law of gravity equal to the required centripetal force yields the equation of  motion of satellites in the circular orbit

i.e Fgravity=Fcentripetal

⇒vorbital=GMr−−−√

Answer : Option C
Explaination / Solution:

Acceleration is the rate of change of velocity with time.It is a vector quantity.

Average acceleration is the change in velocity per unit time over an interval of time.

Let initial velocity at time interval t​​​​​​1 is v​​​​​​1 and final velocity at time interval t​​​​​2 is v​​​​​​2

Then

a⃗ avg=Δv⃗ Δt=v⃗ 2−v⃗ 1t2−t1

Answer : Option B
Explaination / Solution:
No Explaination.

Answer : Option D
Explaination / Solution:

A particle with a vertical and horizontal velocity travelling in a gravitational field will trace out a parabola.

Answer : Option A
Explaination / Solution:

Mass–Energy equivalence states that anything having mass has an equivalent amount of energy and vice versa, with these fundamental quantities directly relating to one another by Einstein's theory of special relativity. It shows that matter (as mass) and energy can be converted into each other according to the famous equation E=mc2

Answer : Option A
Explaination / Solution:

The ratio of stress and strain is called modulus of elasticity is the characteristic of the material. they are (a) Young's modulus (b) Shear Modulus (c) Bulk modulus

Young's Modulus is denoted by Y and is given by  the ratio of tensile (or compressive) stress (σ)" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">(σ) to the longitudinal strain (ε)" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">(ε)

Y = tensile stress/longitudinal strain

Y=σ/ϵ" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Y=σ/ϵ