Question 1

Liquid A and liquid B exert same amount of pressure on each other, but the density of A is twice the density of B. The height of liquid B is 10 cm, then the height of liquid A would be&#10;A)5 cm&#10;B)10 cm&#10;C)20 cm&#10;D)40 cm

Accepted Answer

The pressure exerted by a liquid column is given by $P = \rho gh$, where $P$ is the pressure, $\rho$ is the density of the liquid, $g$ is the acceleration due to gravity, and $h$ is the height of the liquid column. Since the density of A is twice that of B ($\rho_A = 2\rho_B$) and they exert the same pressure, the height of liquid A must be half that of B to maintain the same pressure ($h_A = \frac{h_B}{2}$). Therefore, if the height of liquid B is 10 cm, the height of liquid A would be 5 cm.

Question 2

Incorrect statement for co-efficient of friction could be that&#10;A)The coefficient of friction is denoted by the Greek letter &#181;.&#10;B)The coefficient of friction is directly proportional to the force of friction&#10;C)The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure&#10;D)The coefficient of friction is inversely proportional to the force pressing the surfaces together

Accepted Answer

The coefficient of friction is not constant even in the conditions of fast slipping and high contact pressure.

Question 3

If we move a positive charge to a positive plate, then potential energy of charge is&#10;A)decreased&#10;B)increased&#10;C)remains constant&#10;D)dissipated

Accepted Answer

Moving a positive charge towards a positive plate requires work to be done against the electrostatic repulsive force. This work increases the potential energy of the charge.

Question 4

An instrument commonly used for the measurement of atmospheric pressure is known as&#10;A)Manometer&#10;B)Barometer&#10;C)Calorimeter&#10;D)Potentiometer

Accepted Answer

A barometer is specifically designed to measure atmospheric pressure, which is crucial for weather forecasting and science research. Manometers measure pressure difference, calorimeters measure heat of chemical reactions or physical changes, and potentiometers measure electromotive force.

Question 5

Phase difference between a node and an antinode is&#10;A)90&#176;&#10;B)45&#176;&#10;C)180&#176;&#10;D)360&#176;

Accepted Answer

The phase difference between a node and an antinode in a standing wave is 180° because at a node, the medium does not move (complete destructive interference), while at an antinode, it experiences maximum displacement (constructive interference), indicating they are out of phase by half a cycle.

Question 6

Our weight, as measured by the spring weighing machine is equivalent of&#10;A)The total gravitational force that Earth exerts on us&#10;B)The total centripetal force required to keep us moving on Earth's axis&#10;C)The total gravitational force that Earth exerts on us + The total centripetal force required to keep us moving on Earth's axis&#10;D)The total gravitational force that Earth exerts on us - The total centripetal force required to keep us moving on Earth's axis

Accepted Answer

The weight measured by a spring scale is the gravitational force minus the centripetal force due to Earth's rotation. This is because the centripetal force slightly reduces the effect of gravity, making us weigh less than we would if the Earth were not rotating.

Question 7

Point where spring oscillates with maximum amplitude is called&#10;A)node&#10;B)antinode&#10;C)fixed end&#10;D)movable end

Accepted Answer

An antinode is the point in a standing wave where the oscillation is at its maximum amplitude. In the context of a spring or any system exhibiting wave-like behavior, the antinode represents the point of greatest movement or displacement.

Question 8

According to Newton's law of universal gravitation, any two particles of finite mass attract one another with a force which is&#10;A)Inversely proportional to the product of their masses and directly proportional to the square of their distance apart&#10;B)Inversely proportional to the product of their masses and directly proportional to their distance apart&#10;C)Directly proportional to the product of their masses and inversely proportional to their distance apart&#10;D)Directly proportional to the product of their masses and inversely proportional to the square of their distance apart

Accepted Answer

Newton's law of universal gravitation states that every point mass attracts every other point mass by a force acting along the line intersecting both points. This force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Question 9

Correct example of vector quantities could be&#10;A)Distance and Speed&#10;B)Displacement and Velocity&#10;C)Distance and Displacement&#10;D)Speed and Velocity

Accepted Answer

Vector quantities have both magnitude and direction. Displacement and velocity are examples of vector quantities because they both specify a direction and a magnitude. Distance and speed are scalar quantities, only having magnitude.

Question 10

In a stationary wave, nodes are at&#10;A)fixed points&#10;B)movable points&#10;C)there are no nodes&#10;D)random points

Accepted Answer

Nodes in a stationary wave are at fixed points where the amplitude of vibration is zero due to destructive interference.

Question 11

In the formation of stationary waves, at T&#8260;2 the waves are&#10;A)out of phase&#10;B)in phase&#10;C)diminished&#10;D)twice the amplitude

Accepted Answer

The answer of In the formation of stationary waves, at...

Question 12

A vector quantity is one which has&#10;A)direction as well as magnitude&#10;B)magnitude only&#10;C)direction only&#10;D)no direction, no magnitude

Accepted Answer

The answer of A vector quantity is one which has&#10;A)direction...

Question 13

Centripetal force is dependent on three factors, the odd one out of these factors is&#10;A)Mass of the rotating object&#10;B)Speed of the rotating object&#10;C)Volume of the rotating object&#10;D)Path radius

Accepted Answer

The answer of Centripetal force is dependent on three factors,...

Question 14

Graph of potential energy against distance is&#10;A)curve&#10;B)parabolic&#10;C)hyperbolic&#10;D)straight line

Accepted Answer

The answer of Graph of potential energy against distance is&#10;A)curve&#10;B)parabolic&#10;C)hyperbolic&#10;D)straight...

Question 15

On all instruments like measuring cylinder, pipette and burette, readings are always taken at the bottom of the meniscus of liquid. This is not true for liquids like&#10;A)Oil&#10;B)Ink&#10;C)Mercury&#10;D)Seawater

Accepted Answer

The answer of On all instruments like measuring cylinder, pipette...

Question 16

In a weather map, lines joining all those regions with same atmospheric pressure are called&#10;A)Bars&#10;B)Millibars&#10;C)Isobars&#10;D)Atmospheric bars

Accepted Answer

The answer of In a weather map, lines joining all...

Question 17

For a given system, the minimum frequency of a standing wave is in a&#10;A)fundamental mode&#10;B)lowest mode&#10;C)highest mode&#10;D)peak mode

Accepted Answer

The answer of For a given system, the minimum frequency...

Question 18

In an electric field, energy per unit positive charge is&#10;A)voltage&#10;B)current&#10;C)frequency&#10;D)resistance

Accepted Answer

The answer of In an electric field, energy per unit...

Question 19

In Kundt's dust tube, dust accumulates at&#10;A)nodes&#10;B)antinodes&#10;C)at the end&#10;D)at troughs only

Accepted Answer

The answer of In Kundt's dust tube, dust accumulates at&#10;A)nodes&#10;B)antinodes&#10;C)at...

Question 20

A node having twice the frequency of the fundamental is called&#10;A)half harmonic&#10;B)harmonic&#10;C)double harmonic&#10;D)triple harmonic

Accepted Answer

The answer of A node having twice the frequency of...

Question 21

If frequency of certain wave is f, then it's velocity is {{}} A)v = fλ B)v = T⁄λ C)t² D)1⁄t²

Accepted Answer

The answer of If frequency of certain wave is f,...

Question 22

Origin of gravitational field is&#10;A)charges&#10;B)masses&#10;C)Earth's core&#10;D)matter

Accepted Answer

The answer of Origin of gravitational field is&#10;A)charges&#10;B)masses&#10;C)Earth's core&#10;D)matter...

Question 23

At separation between a node and antinode, wavelength becomes&#10;A)&#955;&#10;B)&#955;&#8260;2&#10;C)&#955;&#8260;4&#10;D)2&#955;

Accepted Answer

The answer of At separation between a node and antinode,...

Question 24

If the plates of capacitor are oppositely charged then the total charge is equal to&#10;A)negative&#10;B)positive&#10;C)zero&#10;D)infinite

Accepted Answer

The answer of If the plates of capacitor are oppositely...

Question 25

Area under current-time graph represents&#10;A)magnitude of charge&#10;B)dielectric&#10;C)amount of positive charge&#10;D)amount of negative charge

Accepted Answer

The answer of Area under current-time graph represents&#10;A)magnitude of charge&#10;B)dielectric&#10;C)amount...

Deck 3: Physics Pressure, Energy, and Waves