cbse 11th physics | Online Objective Test

Motion in A Straight Line Prepare / Learn

Q1. While determining velocity from position-time graph. Velocity at any time is the slope of the _______ to the point on the graph at that instant.

A. line from origin

B. tangent

C. Unit vector

D. perpendicular

Answer : Option B
Explaination / Solution:

Velocity is defined as the rate of change of position with respect to time, which may also be referred to as the instantaneous velocity to emphasize the distinction from the average velocity. In terms of a displacement-time (x vs. t) graph, the instantaneous velocity (or, simply, velocity) can be thought of as the slope of the tangent line to the curve at any point.

Waves Prepare / Learn

Q2. If y(x, t) = a sin (kx + ωt + φ ) represents a wave function then ‘ω’ is

A. the angular frequency

B. the wave number

C. the phase

D. the period

Answer : Option A
Explaination / Solution:

In the equation

y(x, t) = a sin (kx + $ω$ t + $φ$ )

the term with time 't' is called angular angular velocity or angular frequency

Hence $ω$ is the angular frequency.

Work Energy and Power Prepare / Learn

Q3. The total mechanical energy of a system is conserved if the

A. forces, doing work on it, are conservative

B. forces, doing work on it, are damped

C. forces, doing work on it, are viscous

D. forces, doing work on it, are not conservative

Answer : Option A
Explaination / Solution:

Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. In other words, it is energy in an object due to its motion or position, or both. In case of conservative forces total mechanical energy remains conserved because potential energy applicable only for conservative forces.

Motion in A Plane Prepare / Learn

Q4.

An arbitrary vector $\vec{A}$ in a plane can be expressed in terms of its x and y components by the equation

A. A⃗ =Axi^+Ayj

\vec{A} = A_{x} + A_{y}

\vec{A} = A_{x} \hat{i} - A_{y} \hat{j}

C. A⃗ =Axi^−Ayj

D. A⃗ =Ax−Ay

Answer : Option A
Explaination / Solution:

In a two-dimensional coordinate system, any vector can be broken into x -component and y -component.

Vector $\vec{A}$ can be represented as

$\vec{A} = A_{x} \hat{i} + A_{y} \hat{j}$

Where $A_{x}$ is component in direction of x-axis and $\hat{i}$ is a unit vector in same direction of x-axis

And $A_{y}$ is component in direction of y-axis and $\hat{j}$ is a unit vector in same direction of y-axis

System of Particles and Rotational Motion Prepare / Learn

Q5. The angular momentum L of the particle having a position vector r and linear momentum p, with respect to the origin O is defined to be

A. L⃗ =r⃗ ×p⃗

L = \vec{r} \times \vec{p} \times \vec{r}

\vec{L} = \vec{r} \times \vec{p} . \vec{ω}

C. L⃗ =r⃗ ×p⃗ .ω⃗

D. L⃗ =r⃗ ×r⃗ ×p⃗

Answer : Option A
Explaination / Solution:

Angular momentum is also referred as moment of linear momentum

The angular momentum L of a particle of mass m with respect to a chosen origin is given by

$\vec{L} = \vec{r} \times \vec{p}$

Direction of angular momentum is according to right hand rule.

Mechanical Properties of Solids Prepare / Learn

Q6. With reference to figure the yield strength point corresponds to

A. B

B. C

C. D

D. A

Answer : Option A
Explaination / Solution:

Yield point is point on the curve where the body deforms with negligible amount of stress. Hence it should be B

Thermodynamics Prepare / Learn

Q7. In case of isobaric process the volume of an ideal gas change the work done by the gas is given by

A. P / ΔV

B. P + ΔV

C. P ΔV

D. P - ΔV

Answer : Option C
Explaination / Solution:

$\begin{aligned} d W = F . d y = P A . d y = P . d V \\ W = \int_{V_{1}}^{V_{2}} P . d V \end{aligned}$

$W = P (V_{2} - V_{1}) = P Δ V$

Physical World Prepare / Learn

Q8. What is central to the growth of physics?

A. Conjectural descriptions

B. Qualitative descriptions

C. Speculative descriptions

D. Quantitative measurement

Answer : Option D
Explaination / Solution:

Quantitative measurement is central to the growth of physics because Laws of nature happen to be expressible in more precise mathematical equations.

Laws of Motion Prepare / Learn

Q9. According to the law of conservation of momentum,

A. the total momentum of an isolated system of interacting particles is conserved.

B. the total momentum of an interacting system of particles and fields is conserved

C. the momentum of an interacting system of particles and fields is conserved

D. the momentum of an isolated system of interacting particles is conserved

Answer : Option A
Explaination / Solution:

when no external forces acts on a system of several interacting particles, then the total momentum is conserved.

System of Particles and Rotational Motion Prepare / Learn

Q10. Centre of gravity can be defined

A. as that point where the total gravitational torque on the body is greater than zero

B. as that point where the total gravitational force on the body is zero

C. as that point where the total gravitational torque on the body is zero

D. as the center of mass

Answer : Option C
Explaination / Solution:

The point at which the entire weight of a body may be thought of as centered so that if supported at this point the body would balance perfectly, so it can also be defined as as that point where the total gravitational torque on the body is zero.

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