cbse 11th physics | Online Objective Test

# Mechanical Properties of Fluids # CBSE 11TH PHYSICS Prepare / Learn

Q1. According to Pascal’s Law the

A. pressure in a fluid at rest is the same at all points if they are at different heights

B. pressure in a fluid decreases with temperature

C. pressure in a fluid at rest is the same at all points if they are at the same height

D. pressure in a fluid increases with temperature

Answer : Option C
Explaination / Solution:

According to Pascal's Law,

P-P0 = hdg

from above

Change in pressure is directly proportional to depth from the free surface.

At the same horizonatal line all point are at the same depth and have same value of acceleration due to gravity and denity of water as well.

# Kinetic Theory # CBSE 11TH PHYSICS Prepare / Learn

Q2. According to Avogadro’s law:

A. Equal volumes of all gases at equal temperature and pressure have the same number of molecules.

B. Equal volumes of all gases at equal temperature have the same number of molecules.

C. Equal volumes of all gases at equal temperature and pressure have different number of molecules.

D. Equal volumes of all gases at equal pressure have the same number of molecules.

Answer : Option A
Explaination / Solution:

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules"

For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

$\begin{aligned} V \propto n \\ \frac{V}{n} = k \end{aligned}$

# Thermal Properties of Matter # CBSE 11TH PHYSICS Prepare / Learn

Q3.

The correct equation for converting between Fahrenheit temperature $t_{F}$ and Celsius temperature $t_{C}$ is

A. tF+32180=tC100

B. tF−32160=tC100

C. tF−32180=tC120

D. tF−32180=tC100

Answer : Option D
Explaination / Solution:

$\frac{T_{Z} - T_{L}}{T_{U} - T_{L}} = \frac{T_{C} - 0}{100 - 0} = \frac{T_{F} - 32}{212 - 32}$

TU = B.P. of water

TL = M.P. of ice

# Units and Measurements # CBSE 11TH PHYSICS Prepare / Learn

Q4. In SI system the fundamental units are

A. meter, Newton, second, ampere, Kelvin, mole and candela

B. meter, kilogram, second, ampere, Kelvin, mole and candela

C. meter, kilogram, second, ampere, Kelvin, mole and watt

D. meter, kilogram, second, coulomb, Kelvin, mole and candela, horse power

Answer : Option B
Explaination / Solution:

The SI base units and their physical quantities are the metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.

# Oscillations # CBSE 11TH PHYSICS Prepare / Learn

Q5. Frequency of the periodic motion is

A. time taken to complete one oscillation

B. twice the period of oscillation

C. the reciprocal of the period of oscillation

D. the reciprocal of the wave velocity

Answer : Option C
Explaination / Solution:

Frequency is defined as number of oscillation completed by an oscillating body in unit time i.e. in one second during oscillatory motion.

$ν = \frac{1}{T}$

# Gravitation # CBSE 11TH PHYSICS Prepare / Learn

Q6.

Newton’s law of universal gravitation states that the gravitational force of attraction between any two particles of masses m1 and m2 separated by a distance r has the magnitude

A. ∣F→∣∣∣=m1m2r2

B. ∣F→∣∣∣=Gm2r2

C. ∣F→∣∣∣=Gm1r2

D. ∣∣∣F→∣∣∣=Gm1m2r2

Answer : Option D
Explaination / Solution:

According to Newton's law of universal gravitation, the force of attraction between two objects is directly proportional to the product of two masses and inversely proportional to the square of the distance between them

# Motion in A Straight Line # CBSE 11TH PHYSICS Prepare / Learn

Q7. In Kinematics we study

A. Ways to find jerk without going into the causes of motion.

B. Ways to find acceleration without going into the causes of motion.

C. Ways to describe motion without going into the causes of motion.

D. Ways to find velocity without going into the causes of motion.

Answer : Option C
Explaination / Solution:

Kinematics is a branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies (groups of objects) without considering the mass of each or the forces that caused the motion.

# Waves # CBSE 11TH PHYSICS Prepare / Learn

Q8. The quantity similar to extension or compression of the spring in sound wave propagation (air) is

A. the change in air composition

B. the change in air density

C. the change in air particles

D. the change in air humidity

Answer : Option B
Explaination / Solution:

As in air wave propagates in the form of compression (increase in density of air) and rarefaction (decrease in density of air).

# System of Particles and Rotational Motion # CBSE 11TH PHYSICS Prepare / Learn

Q9. In a general motion of a rigid body

A. both translation and rotation can be present

B. only translation is present

C. particles on the body always move around an axis in circlesC

D. only rotation is present

Answer : Option A
Explaination / Solution:

In general motion of the body can be seen as the combination of pure translation of the center of mass and pure rotation of the body about the center of mass like the motion of a wheel.

# Physical World # CBSE 11TH PHYSICS Prepare / Learn

Q10. Which of the following is a possible final step in applying the scientific method

A. Building a theory

B. Formulation of a question

C. Analysis of test results

D. Formulating a hypothesis

Answer : Option C
Explaination / Solution:

Your experiment tests whether your prediction is accurate and thus your hypothesis is supported or not. It is important for your experiment to be a fair test. You conduct a fair test by making sure that you change only one factor at a time while keeping all other conditions the same. You should also repeat your experiments several times to make sure that the first results weren't just an accident.

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