cbse 11th physics | Online Objective Test

Mechanical Properties of Solids Prepare / Learn

Q1. volume strain is defined

A. as the ratio of change in volume (ΔV) to thrice the original volume V

B. as the change in volume ΔV

C. as the ratio of change in volume (ΔV) to twice the original volume V

D. as the ratio of change in volume (ΔV) to the original volume V

Answer : Option D
Explaination / Solution:
No Explaination.

Thermodynamics Prepare / Learn

Q2. First Law of Thermodynamics is

The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes:

$Δ Q = Δ U + Δ W$

A. the general law of conservation of momentum applied to any system in which the energy transfer from or to the surroundings is taken into account

B. the general law of conservation of angular momentum applied to any system in which the energy transfer from or to the surroundings is taken into account

C. the general law of conservation of mass applied to any system in which the energy transfer from or to the surroundings is taken into account

D. the general law of conservation of energy applied to any system in which the energy transfer from or to the surroundings is taken into account

Answer : Option D
Explaination / Solution:
No Explaination.

Physical World Prepare / Learn

Q3. Newtonian mechanics could not explain

A. fall of bodies on earth

B. Some of the most basic features of atomic phenomena.

C. movement of planets

D. flight of rockets

Answer : Option B
Explaination / Solution:

When science progressed into the realm of the microscopic, of dimensions the size of an atom, i.e. less than a nanometer, it was observed that newtonian mechanics and classical electrodynamics were in contradiction with experiments, could not explain them. At the microscopic level, forces don't have a meaning, because nothing touches directly anything else. There are intermediate force carriers of what is perceived as "force" macroscopically.

Laws of Motion Prepare / Learn

Q4. The force acting on a freely falling body in terms of mass m and acceleration due to gravity g is

A. F =

m^{- 2}

B. F =

m^{2}

C. F = m

g^{2}

D. F = mg

Answer : Option D
Explaination / Solution:

according to newton's second law of motion F = ma here acceleration is due to gravity and is equal to g. So that for a freely falling body F = mg

Mechanical Properties of Fluids Prepare / Learn

Q5. In a hydraulic lift the force applied on the smaller cylinder of area A1 is F1. If the area of the larger cylinder is A2 the maximum weight that can be lifted is

A. F1A2

B. A1A2F1

C. F1

D. A2A1F1

Answer : Option D
Explaination / Solution:

According to Pascal's Law,

Pressure applied to any point inside the liquid is trnasmiteed equally in all direction so,

Pressure applied on the smaller cylinder is equal to the pressure on the other cylinder,which is given by

$\frac{F_{1}}{A_{1}} = \frac{F_{2}}{A_{2}}$

So,

Maximum force on the other side is ,

F2 = $\frac{A_{2}}{A_{1}} \times F_{1}$

Kinetic Theory Prepare / Learn

Q6.

Considering a gas in a parallelopiped, in a small time interval $Δ t$ , a molecule with x-component of velocity $v_{x}$ will hit the wall

A. if it is outside or beyond the distance

v_{x}

Δ t

from the wall

B. if it is within the distance

2 v_{x}

Δ t

from the wall

C. if it is outside or beyond the distance

2 v_{x}

Δ t

from the wall

D. if it is within the distance

2 v_{x}

Δ t

from the wall

Answer : Option D
Explaination / Solution:

Collision by moleculeto the wall of conntainer assumed to be perfectly elastic.

By the principle of conservation of momentum, the momentum imparted to the wall in the collision = 2mvx

So the magnitude of the force on the wall from each collision is

$F = \frac{2 m v_{x}}{Δ t}$

distance travelled in time $Δ t$

$Δ t$

$x = v_{x} Δ t$

Thermal Properties of Matter Prepare / Learn

Q7. compared to glass copper expands

A. about the same

B. two times less

C. five times more

D. three times less

Answer : Option C
Explaination / Solution:

The coefficient of linear expansion is more for copper then that of glass.

Units and Measurements Prepare / Learn

Q8. Resolution is

A. the smallest amount of input signal change that the instrument can detect reliably

B. a measure of the bias in the instrument

C. a measure of the systematic errors

D. None of these

Answer : Option A
Explaination / Solution:

Resolution is the smallest amount of input signal change that the instrument can detect reliably. This term is determined by the instrument noise (either circuit or quantization noise).

Oscillations Prepare / Learn

Q9. The total mechanical energy of a harmonic oscillator

A. increases linearly with time

B. decreases linearly with time

C. is independent of time

D. increases quadratically with time

Answer : Option C
Explaination / Solution:
No Explaination.

Gravitation Prepare / Learn

Q10. The force of attraction between a hollow spherical shell of uniform density and a point mass situated outside is just as if the entire mass of the shell is

A. equally concentrated at three points on a triangle of the shell.

B. concentrated at the centre of the shell.

C. equally concentrated at opposite ends of the diameter of the sphere

D. equally concentrated at four points on a square of the shell.

Answer : Option B
Explaination / Solution:

According to Shell's theorem, If a particle of mass m is located outside a spherical shell of mass M at, for instance, point P, the shell attracts the particle as though the mass of the shell were concentrated at its centre. Thus, as far as the gravitational force acting on a particle outside the shell is concerned, a spherical shell acts no differently from the solid spherical distributions of mass.

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