Physics

Which state of matter has neither a fixed shape nor a fixed volume?

The motion of molecules in a gas is:

Fusion is another term used for:

Which of the following has the highest intermolecular space?

Which statement correctly describes the change in molecular motion during the boiling of water?

Why do solids have a high density?

The phenomenon where molecules of two different substances mix on their own is:

Which of these processes involves the direct conversion of a gas to a solid?

Why does the pressure of a gas increase when its temperature is raised in a rigid container?

According to Kinetic Theory, what is the 'absolute zero' temperature?

The mass of a wooden block is $120 g$ and its volume is $200 cm^3$. Its density is:

When salt is dissolved in water, the density of the solution:

A piece of cork has a density of $0.25 g/cm^3$. What is its Relative Density?

The volume of a sphere is calculated using which of the following (where $r$ is radius)?

Which of these is the correct expression for density ($d$)?

The R.D. of a liquid is $1.5$. If the mass of $100 ml$ of water is $100 g$, what is the mass of $100 ml$ of this liquid?

What happens to the density of air in a sealed container if the volume is reduced to half by a piston?

A piece of wood weighs $40 \, g$ in air. A piece of metal of mass $70 \, g$ and RD $7$ is attached to it. The combination weighs $60 \, gf$ in water. Find the RD of the wood.

If $M_1$ is the mass of a density bottle filled with water and $M_2$ is the mass of the same bottle filled with a liquid of relative density $0.8$, and the empty mass of the bottle is $20 \, g$, find the relationship between $M_1$ and $M_2$.

Relative density has which of the following units?

The steering wheel of a car is an example of:

A person stands on a mattress and then lies down on it. In which case is the mattress compressed more?

Atmospheric pressure is maximum at:

When you press a juice pack with a straw, juice comes out. This is due to:

Why do cooking pots have flat, wide bases?

If the height of a mercury column in a barometer is $76\ cm$, and the density of mercury is $13600\ kg/m^3$, what is the pressure in $Pa$? (Take $g = 9.8\ m/s^2$)

A body is in equilibrium under the action of several forces. The sum of the clockwise moments about any point must be:

Which of these devices does NOT work on the principle of atmospheric pressure?

If a hole is drilled in the side of a tall water-filled cylinder, the speed of the water jet is greatest when the hole is:

A pressure of $100\text{ Pa}$ is acting on a surface of area $5\text{ m}^2$. If the area is reduced to $0.5\text{ m}^2$ while keeping the force same, the new pressure is:

When we wind a watch spring, we store energy in it in the form of:

Which energy is produced when we ring a school bell?

A body at a certain height above the ground has 100 J of potential energy. If it falls halfway, its potential energy becomes:

In a hydroelectric power plant, the kinetic energy of flowing water is finally used to produce:

Which of the following is an example of a body possessing both kinetic and potential energy?

A microphone converts _______ energy into _______ energy.

What is the work done by a person who carries a $5\text{ kg}$ bag and climbs up a slope of vertical height $10\text{ m}$? (Assume $g = 10\text{ m/s}^2$)

A bullet of mass $10 g$ leaves a rifle at a speed of $400 m/s$. What is its kinetic energy?

A man of mass $50 kg$ carries a bag of $10 kg$ on his head and walks $10 m$ on a horizontal road. What is the work done by the man against gravity?

What is the ratio of potential energy of a body of mass $m$ at height $h$ to its kinetic energy just before hitting the ground if it is dropped from that height?

A ray of light traveling from air into a diamond (very dense) will:

What happens to the focal length of a lens if its surfaces are made more curved (more bulging)?

Which of the following occurs because light travels at different speeds in different colors through a prism?

If an object is placed at the principal focus of a convex lens, where is the image formed?

An object is placed at a distance of $30$ cm from a convex lens that has a focal length of $20$ cm. What will be the nature and size of the image formed?

If an object is moved closer to a convex lens (but staying beyond $F$), the real image formed moves:

The centers of the two imaginary spheres of which the lens surfaces are parts are called:

Two thin lenses of focal lengths $+10\text{ cm}$ and $+20\text{ cm}$ are separated by a distance of $5\text{ cm}$. What is the effective power of the system (Conceptual focus on combination)?

A concave lens has a focal length of $20\text{ cm}$. Where should an object be placed so that the image is formed at $10\text{ cm}$ from the lens?

What happens to the angle of deviation produced by a prism if the wavelength of incident light is increased?

Normal human body temperature is approximately:

How many Joules make up one kilocalorie?

What is the boiling point of pure water at sea level?

Which of these is NOT a method of heat transfer?

In a room heater, heat is distributed throughout the room primarily by:

Why is ice packed in sawdust to prevent it from melting?

The heat from a bonfire reaches us mainly by which method?

A glass bottle completely filled with water and tightly capped is placed in a freezer. It will likely burst because:

If a solid is heated uniformly, its volume expansion is given by $\Delta V = V \gamma \Delta T$. The relationship between $\gamma$ and the linear coefficient $\alpha$ is:

When a solid melts into a liquid, the temperature remains constant even though heat is being supplied. This heat is known as:

Which of the following frequencies is in the ultrasonic range?

Which of these will have the highest pitch?

How does sound travel from a ringing bell to your ears?

The unit $Hz$ measures how many vibrations occur in:

If a vibrating object has a time period of $0.05$ seconds, how many oscillations will it complete in $10$ seconds?

A wave is represented in a medium. What does the distance between two consecutive compressions represent?

The pitch of a sound is determined by the frequency of vibration. Which of the following sounds likely has the highest frequency?

A sound wave has a frequency of $500\ Hz$. What is the phase difference (in terms of time) between two points which are $1/4$ of a wavelength apart?

Which of the following statements about sound propagation is FALSE?

The unit 'decibel' is used to express which characteristic of sound?

In the following electrical circuit, which symbol represents the component used to measure the current flowing through the lamp?

Which effect of electric current is used in an electric room heater?

Which of these is a safety device that melts and breaks the circuit during an overflow of current?

What is the SI unit of electric current?

A student sets up the circuit shown below with two identical resistors, $R_1$ and $R_2$. If the switch $S$ is closed, what will happen to the total resistance of the circuit?

Which instrument is used to detect the presence of a small static charge on a body?

Which of the following occurs at the cathode during the electrolysis of water?

In a physics lab, a group of students connects three identical resistors, each of $12 \, \Omega$, in a mixed circuit as shown in the diagram. If the ammeter connected near the $24V$ battery reads the total current, calculate the heat energy produced in the entire circuit if the switch is kept closed for exactly $5$ minutes ($300$ seconds).

A student sets up an experiment to observe the chemical effects of electric current using two different electrodes in a copper sulphate ($CuSO_4$) solution. During the process, she notices a layer of reddish-brown metal depositing on one of the electrodes. If the battery is connected as shown in the diagram, which electrode will receive the deposit and what is the primary reason behind this phenomenon according to Faraday's observations?

A wire of resistance $10 \Omega$ is stretched uniformly until its length is doubled. If the volume of the wire remains constant during stretching, what will be the new resistance of the wire?