Physics

Which of these instruments offers the highest precision for measuring length among the four?

What is the reading on the circular scale of a screw gauge if the 25th division coincides with the reference line?

In a Vernier Calliper, if $n$ divisions of the Vernier scale coincide with $(n-1)$ divisions of the main scale, the least count is:

The main scale of a screw gauge is also called the:

A Vernier Calliper has its main scale in cm. If $10$ divisions of the Vernier scale cover $9 \text{ mm}$, the least count is:

The zero of the circular scale is $3$ divisions above the index line of the main scale. If the least count is $0.01 \text{ mm}$, the zero error is:

In a Vernier Calliper, $10 \text{ VSD}$ coincides with $8$ divisions of the main scale. If $1 \text{ MSD} = 1 \text{ mm}$, the least count is:

In measuring the diameter of a sphere with a Vernier calliper ($LC = 0.01 \text{ cm}$), the MSR is $2.3 \text{ cm}$ and the VSD is $4$. If the true diameter is $2.31 \text{ cm}$, what is the zero error of the instrument?

A screw gauge has a pitch of $0.5 \text{ mm}$ and a circular scale with $50$ divisions. If the zero of the circular scale is $4$ divisions 'below' the reference line, find the zero error and the zero correction.

A Vernier calliper has $M$ divisions per cm on the main scale. If $V$ divisions of the Vernier scale coincide with $(V-1)$ divisions of the main scale, the least count in cm is:

Which of the following stays constant in uniform motion along a straight line?

What is the speed of an object moving at $36 \text{ km/h}$ expressed in $m/s$?

Which of the following describes a scalar quantity?

The rate of change of displacement is:

A particle moves along a straight path. The diagram below shows the velocity of the particle at three specific time points. If the acceleration is uniform from $t = 0 \text{ s}$ to $t = 5 \text{ s}$, what is the total distance covered by the particle in $10 \text{ s}$?

A stone is dropped from a cliff. What is its displacement after $2 \text{ seconds}$? (Take $g = 10 \text{ m/s}^2$)

If an object covers equal distances in equal intervals of time, however small the intervals may be, the object is said to have:

A particle moves in a straight line with a constant acceleration. It changes its velocity from $10\text{ m/s}$ to $20\text{ m/s}$ while covering a distance of $135\text{ m}$ in $t$ seconds. The value of $t$ is:

A motor car is moving with a speed of $20\text{ m/s}$ on a circular track of radius $100\text{ m}$. If it increases its speed at the rate of $3\text{ m/s}^2$, what is its resultant acceleration?

A stone is dropped from a certain height and it takes $4\text{ s}$ to reach the ground. If it is stopped after $3\text{ s}$ of its fall and then allowed to fall again, the total time taken to reach the ground from the start is:

A body of mass $10 \text{ kg}$ is taken to the Moon. Its mass on the Moon will be:

In the absence of air resistance, all falling bodies have the same:

Which of the following is the correct unit of acceleration?

Weight is a:

The SI unit of momentum is:

Two bodies of different masses $m_1$ and $m_2$ ($m_1 > m_2$) have the same linear momentum. Which one has higher velocity?

Which law of motion gives the quantitative measure of force?

The law of gravitation is called 'universal' because:

A body of mass $m$ is taken from the Earth's surface to a height equal to the radius of the Earth ($R$). The change in its weight is:

Two planets $A$ and $B$ have the same radius. The mass of planet $A$ is $M$ and the mass of planet $B$ is $4M$. If the escape velocity from planet $A$ is $v$, what is the escape velocity from planet $B$?

If the density of a body is equal to the density of the liquid, the body will:

According to the Law of Floatation, a floating body displaces a weight of liquid:

The unit 'Atmosphere' ($atm$) is used to measure:

If a body has a relative density of $0.8$, it will:

Why does a sharp knife cut objects more easily than a blunt one?

A body of volume $100\ cm^3$ is completely immersed in water (density $1\ g/cm^3$). The upthrust on the body is: (Take $g = 980\ cm/s^2$)

Upthrust is also known as:

A boat having a length of $3\ m$ and breadth $2\ m$ is floating on a lake. The boat sinks by $1\ cm$ when a man gets on it. What is the mass of the man?

A container is filled with water to a height $H$. A small hole is made at depth $h$ below the surface. At what distance from the foot of the wall does the stream strike the floor?

What is the force required to keep a block of wood of mass $50\ g$ and density $0.6\ g/cm^3$ completely submerged in water?

The device used to convert light energy into electrical energy is a:

What is the freezing point of water on the Kelvin scale?

Which fuel is primarily used in traditional cookstoves in rural areas?

What is the relationship between $1$ calorie and Joules?

A faulty thermometer is calibrated such that its lower fixed point (ice point) is $10^{\circ}C$ and its upper fixed point (steam point) is $90^{\circ}C$. If this thermometer measures the temperature of a liquid as $60^{\circ}C$, what is the actual temperature of the liquid on a correctly calibrated Celsius scale?

Which energy source is obtained from the heat trapped inside the Earth?

Which of the following correctly describes the relationship between the Celsius ($C$) and Kelvin ($K$) scales?

Which property of water makes it an excellent coolant for car radiators?

Identify the 'odd one out' based on the primary source of energy generation.

Anomalous expansion of water occurs between which temperature range?

If you stand $2 \text{ m}$ away from a plane mirror, what is the distance between you and your image?

When light reflects from a smooth, polished surface like a still pond, it is called:

Which mirror is used in searchlights and headlights of vehicles?

The angle of incidence is the angle between the:

If a mirror forms an erect image for all possible positions of the object in front of it, the mirror could be:

According to the Cartesian sign convention, distances measured upward and perpendicular to the principal axis are taken as:

In a simple periscope, the two plane mirrors are positioned:

A convex mirror of focal length $10\text{ cm}$ forms an image at $5\text{ cm}$ from the pole. What is the distance of the object?

If the magnification produced by a mirror is $-3$, the mirror is ________ and the object is placed ________.

What happens to the focal length of a spherical mirror if it is cut into two horizontal halves along the principal axis?

Why is the flash of lightning seen before the sound of thunder is heard?

The physical quantity that is carried by a sound wave from the source to the listener is:

Which of the following can hear infrasonic sounds?

What happens to the speed of sound when it moves from air into water?

The frequency of a sound wave is $2\text{ kHz}$ and its wavelength is $35\text{ cm}$. How long will it take to travel $1.4\text{ km}$?

The property of sound which distinguishes a sharp sound from a dull sound is:

What is the frequency of a wave if its time period is $10^{-3}\text{ s}$?

The loudness of sound is measured in which unit?

A wave moves a distance of $8\text{ m}$ in $0.02\text{ s}$. If the frequency is $2\text{ kHz}$, the wavelength is:

In a gas, the speed of sound is $v$. If the absolute temperature is tripled and the frequency is doubled, the new speed is:

An glass rod is rubbed with silk and becomes positively charged. Which of the following explains the phenomenon based on the atomic model?

The S.I. unit of potential difference is:

Which component is used to close or open an electric circuit?

If a glass rod is rubbed with silk, the glass rod acquires a _______ charge.

In the given circuit, if the potential difference across the battery is $V = 12V$ and the resistors are $R_1 = 4\Omega$ and $R_2 = 2\Omega$ connected in series, what is the current $I$ flowing through the circuit?

In a simple circuit with a cell and a lamp, which direction does the 'conventional current' flow?

If the length of a wire is doubled and its cross-sectional area is kept the same, its resistance will:

A student in a lab is investigating the behavior of non-ohmic conductors using a specialized filament bulb and an unknown resistor $R$. As shown in the circuit diagram, the battery provides a constant potential difference of $12\,V$. When the switch is closed, the ammeter reads $0.5\,A$. If the potential difference across the filament bulb is measured to be $4.5\,V$, what is the resistance of the unknown resistor $R$, and what is the total power dissipated by the entire circuit?

Three identical cells, each of EMF 1.5V and internal resistance $0.5 \Omega$, are connected in series to an external resistor of $4.5 \Omega$. What is the potential difference across the terminals of the battery (the combination of three cells) when the circuit is closed?

Consider a circuit consisting of a cell, a switch, and two lamps $L_1$ and $L_2$ connected in series. A high-resistance voltmeter is connected across $L_1$. If $L_2$ suddenly burns out (filament breaks), what will happen to the readings on the voltmeter and an ammeter placed in series with the cell?