Question Set A

CBSE 11th Physics Units and Measurements Model Questions Papers Study Material - QB365

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Questions:

Multiple Choice Question

35 x 1 = 35

. lf the acceleration due to gravity at earth is 'g' and mass of earth is 80 times that of moon and radius of earth is 4 times that of moon, the value of 'g' at the surface of moon will be

(a)

(b)

g/20

(c)

g/5

(d)

320/g

The earth is an approximate sphere. If the interior contained matter which is not of the same density everywhere, then on the surface of the earth, the acceleration due to gravity

(a)

will be directed towards the centre but not the same everywhere.

(b)

will have the same value everywhere but not directed towards the centre.

(c)

will be same everywhere in magnitude directed towards the centre.

(d)

cannot be zero at any point.

A constant force is acting perpendicular to the velocity of a particle. For this situation which one is correct?

(a)

Velocity is constant.

(b)

Acceleration is constant

(c)

Momentum will be constant

(d)

Particle will follow elliptical path.

Angle that the vector \(\vec{A}=2 \hat{i}+2 \hat{j}\) makes with y-axis is

(a)

tan^-1 (3/2)

(b)

tan^-1(2/3)

(c)

sin^-1(2/3) .

(d)

cos^-1(3/2)

The length of seconds hand of a watch is 1 cm, The change in velocity of its tip in 15 seconds in cm/s is

(a)

zero

(b)

\(\frac{x}{(30 \sqrt{2})}\)

(c)

\(\frac{\pi}{30}\)

(d)

\(\frac{2 \pi}{(30 \sqrt{2})}\)

A particle moving with a uniform acceleration travels 24 metre and 64 metre in first two consecutive intervals of 4 seconds each. Its initial velocity is

(a)

1 m/s

(b)

2 m/s

(c)

5 m/s

(d)

10 m/s

Pressure is defined as: ______.

(a)

Momentum per unit area

(b)

Momentum per unit area per unit time

(c)

Momentum per unit volume

(d)

Energy per unit volume

In our solar system/the inter-planetary region has chunks of matter (much smaller in size compared to planets) called asteroids. They

(a)

will not move around the sun, since they have very small masses compared to the sun

(b)

will move in an irregular way because of their small masses and will drift away into outer space

(c)

will move around the sun in closed orbits but not obey Kepler's laws

(d)

will move in orbits like planets and obey Kepler's laws

A point mass m is placed at the centre of the square ABCD of side a units as shown below.

The resultant gravitational force on mass m due to masses m₁and m₂ plant on the vertices of square is

(a)

\(\frac{G m_{1} m_{2}}{(a \sqrt{2})^{2}}\)

(b)

\(\frac{2 G m\left(m_{1}+m_{2}\right)}{a^{2}}\)

(c)

zero

(d)

\(\frac{G m\left(m_{1}+m_{2}\right)}{(a \sqrt{2})^{2}}\)

10.

Two cars A and B move along a concentric circular path of radius r_A and r_B with velocities v_A and v_Bmaintaining constant distance, the \(\frac{v_{A}}{v_{B}}\) is equal to

(a)

\(\frac{r_{B}}{r_{A}}\)

(b)

\(\frac{r_{A}}{r_{B}}\)

(c)

\(\frac{r_{A}^{2}}{r_{B}^{2}}\)

(d)

\(\frac{r_{B}^{2}}{r_{A}^{2}}\)

11.

The quantities A_x and A_y are called x and y components of the vector A. Note that A_x is itself not a vector, but A_x \(\hat{\mathbf{i}}\) is a vector, and so is A_y\(\hat{\mathbf{j}}\). Using simple trigonometry, we can express A_x and A_y in terms of the magnitude of A and the angle it makes with the x-axis
A_x = A cos\(\theta\)
A_y = A sin\(\theta\)
Choose the correct figure on the basis of given description.

(a)

(b)

(c)

(d)

None of these

12.

A man standing on a road has to hold his umbrella at 30° with the vertical to keep the rain away. He throws the umbrella and starts running at 10 kmh ^-1. He finds that raindrops are hitting his head vertically. The actual speed of raindrops is

(a)

20 kmh ^-1

(b)

\(10 \sqrt{3} \mathrm{kmh}^{-1}\)

(c)

\(20 \sqrt{3} \mathrm{kmh}^{-1}\)

(d)

10 kmh ^-1

13.

The coordinates of object with respect to a frame of reference at t = 0 are (-1,0, 3). 1ft = 5 s, its coordinates are (-1, 0, 4), then the object is in

(a)

motion along z-axis

(b)

motion along x-axis

(c)

motion along y-axis

(d)

rest position between t = 0 sand t = 5 s

14.

Among the given following system of unit which is not based on unit of mass, length and time?

(a)

CGS

(b)

FPS

(c)

MKS

(d)

15.

Which one of the following physical quantities is not a fundamental quantity?

(a)

Luminous intensity

(b)

Thermodynamic temperature

(c)

Electric current

(d)

Work

16.

The density of a material in CGS system is 10 g cm^-3. If unit of length becomes 10 cm and unit of mass becomes 100 g, the new value of density will be _____.

(a)

10 units

(b)

100 units

(c)

1000 units

(d)

1 unit

17.

Given, force \(=\frac{\alpha}{\text { Density }+\beta^{3}}\) What are the dimensions of \(\alpha ,\beta\) _____.

(a)

\(\left[\mathrm{ML}^{2} \mathrm{~T}^{-2}\right],\left[\mathrm{ML}^{-1 / 3}\right]\)

(b)

\(\left[M^{2} L^{4} T^{-2}\right],\left[M^{1 / 3} L^{-1}\right]\)

(c)

\(\left[\mathrm{M}^{2} \mathrm{~L}^{-2} \mathrm{~T}^{-2}\right],\left[\mathrm{M}^{1 / 3} \mathrm{~L}^{-1}\right]\)

(d)

\(\left[\mathrm{M}^{2} \mathrm{~L}^{-2} \mathrm{~T}^{-2}\right],\left[\mathrm{ML}^{-2}\right]\)

18.

Which of the following sets have different dimensions?

(a)

Dipole moment, Electric field and Electric flux

(b)

Pressure, Young's modulus, Stress

(c)

Heat, Work, Energy

(d)

Emf, Potential difference and potential.

19.

The mean length of an object is 5 cm. Which of the following measurements is most accurate?

(a)

4.9 cm

(b)

4.805 cm

(c)

5.25 cm

(d)

5.4 cm

20.

The ratio of the volume of the atom to the volume of the nucleus is of the order of _____.

(a)

10¹⁵

(b)

10²⁵

(c)

10²⁰

(d)

10¹⁰

21.

The damping force on an oscillator is directly proportional to the velocity. The unit of the constant of proportionality is _____.

(a)

Kg ms^-1

(b)

kg ms^-2

(c)

kg s^-1

(d)

kg s

22.

In case of a moving body

(a)

displacement > distance

(b)

displacement < distance

(c)

displacement ≥ distance

(d)

displacement ≤ distance

23.

The area under the velocity time graph between any two instants t = t₁and t = t₂ gives the distance covered in a time \(\delta \) t = t₂ - t₁.

(a)

only if the particle moves with a uniform acceleration

(b)

only if the particle moves with a uniform velocity.

(c)

only if the particle moves with an acceleration increasing at a uniform rate.

(d)

in all cases irrespective of whether the motion is one of uniform velocity, or of uniform acceleration or of variable acceleration

24.

The displacement x of a particle varies with time according to the relation x=\(\frac { a }{ b } \)(1-e^-bt). Then

(a)

At t =\(\frac { 1 }{ b } \) , the displacement of the particle is nearly (2/3) (a/b).

(b)

The particle cannot reach a point at a distance x from its starting position if x> a/ b.

(c)

The velocity and acceleration of the particle at t = 0 are a and - ab respectively.

(d)

The particle will come back to its starting point as t ⇾∞.

25.

Two planets have same density but different radii.The acceleration due to gravity would be

(a)

same on both the planets

(b)

greater on the smaller planet

(c)

greater on the larger planet

(d)

dependent of the distance of planet from sun

26.

A spaceship moving through the earth's atmosphere is likely to catch fire.This is due to

(a)

surface tension of air

(b)

viscosity of air

(c)

high temperature of the upper atmosphere

(d)

greater portion of O₂ in atmosphere is at higher height

27.

Mass of Mars is 1/9 and radius 1/2 that of the earth. A body Weights 5.4kg wt on the surface of the earth, its Weight on the surface of the mars will be (in kg. wt)

(a)

5.4

(b)

2.4

(c)

1.2

(d)

(e)

28.

The dimensional formula for gravitational constant G is

(a)

ML³T^-2

(b)

M^-1L^-3T²

(c)

M^-1L^-3T^-²

(d)

M^-1L^-3T²

(e)

M^-1L³T²

29.

A car travels from A to B at a speed 'v' and comes back to A at a speed 60 kmph. If the average speed of the car is 48 kmph. 'v' is:

(a)

40 kmph

(b)

50 kmph

(c)

45 kmph

(d)

None

30.

A student goes from his house to his friend's house with speed v₁. Finding the door of his friend's house closed, returns back to his own house with the speed v₂. Then the average speed of the student is:

(a)

(v₁+v₂)2

(b)

\(\sqrt{{v}_{1}}{v}_{2}\)

(c)

2v₁v₂/v₁+v₂

(d)

v₁v₂

31.

In the above problem, the average velocity of the car is;

(a)

48 Kmph

(b)

50 Kmph

(c)

55 Kmph

(d)

Zero

(e)

None

32.

A vehicle travels a distance in 20 minutes in such a way that in first 10 minutes the speed is 40 Kmph and in last 10 minutes, the speed is 60 Kmph. The average speed of the vehicle is: ______.

(a)

48 Kmph

(b)

50 Kmph

(c)

55 Kmph

(d)

60 Kmph

(e)

None

33.

If the range of a gun Which fires of a shell with velocity V is R, then the angle of elevation of the gun is:

(a)

cos^-1(V²/gR)

(b)

1/2(gR/V²)

(c)

1/2sin^-1(gR/V²)

(d)

1/2V²/gR

34.

Two perpendicular forces of 8N and 6N can produce the effect of a single force equal to

(a)

(b)

(c)

(d)

10N

35.

If n is the numerical value and u is the unit of physical quantity \(\rho\), then _____.

(a)

\(\rho\) = mu

(b)

\(\rho\) = mu

(c)

\(\rho\) = mu

(d)

\(\rho\) = mu

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Answers Key:

Multiple Choice Question

35 x 1 = 35

(d)
cannot be zero at any point.

(b)
Acceleration is constant

(b)
tan^-1(2/3)

(a)
1 m/s

(b)
Momentum per unit area per unit time

(d)
will move in orbits like planets and obey Kepler's laws

10.

(b)
\(\frac{r_{A}}{r_{B}}\)

11.

12.

(a)
20 kmh ^-1

13.

(a)
motion along z-axis

14.

(d)
SI

15.

(d)
Work

16.

(b)
100 units

17.

18.

(a)
Dipole moment, Electric field and Electric flux

19.

(a)
4.9 cm

20.

(a)
10¹⁵

21.

22.

(d)
displacement ≤ distance

23.

(d)
in all cases irrespective of whether the motion is one of uniform velocity, or of uniform acceleration or of variable acceleration

24.

(a)
At t =\(\frac { 1 }{ b } \) , the displacement of the particle is nearly (2/3) (a/b).

25.

26.

(b)
viscosity of air

27.

(b)
2.4

28.

29.

(a)
40 kmph

30.

31.

(d)
Zero

32.

(b)
50 Kmph

33.

34.

(d)
10N

35.

(d)
\(\rho\) = mu

CBSE 11th Physics Units and Measurements Model Questions Papers Study Material - QB365 Set A

QB365 Student Learing Managemnet System

Std: 11th Standard CBSE - Physics

chapter: Units and Measurements - Model Questions Papers

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Questions:

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Answers Key:

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