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A box of mass 20 kg is pushed along a rough floor with a velocity 2 $\frac{m}{s}$ and then let go. The box moves 5 m on the floor before coming to rest. What must be the frictional force acting on the box?

Two resistors of the same material and cross section area but different lengths $L_1$ & $L_2$ have their resistances in the ratio

Which among the following proverb is related to thiruvathira njattuvela?

If you are walking at constant velocity of 8 km/h and a car passed you by at the speed of 20

km/h from behind, what is the car's velocity from your viewpoint?

Mechanical oscillation of particles in a medium will produce:-

The motion under gravity is an example of:

Which has a longer time period a satellite revolving close or away from the surface of the earth

What is reset and motion?

The figure shows x-t graphs of two cars A and B. The velocity of car A with respect to car B will be

A sound wave travels from east to west. In which direction do the particles of air move?

The gravitational force between two bodies is

If there are 10 minor divisions between two major divisions, one major division representing $1^{\circ }C$, one minor division will be equal to

If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed:

The slope of the velocity-time graph gives _____.

The mass of the bullet is $2kg$ and velocity of bullet after firing is $25m{s}^{-1}$. If initial velocity of gun and bullet is zero, what is the final momentum of gun after firing?

difference between a simple microscope, light microscope, and compound microscope.

What conclusion can you draw about the speed of a body from the following distance-time graph ?

What is the relation between rad/s ² and r p s ²?

The motion of the particles of a medium when a sound wave is passing through it is:

A cylindrical vessel containing water at 4^o C, if the cross-section of the vessel is 100 cm², the pressure at a point in water at a depth of 10 cm will be :

(g = 10m/s²)

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned two revolutions.

(i) What is the pitch of screw gauge ?

(ii) What is the least count of the screw gauge ?

A metal solid cylinder tied to a thread is hanging from the hook of a spring balance. The cylinder is gradually immersed into water contained in a jar. What changes do you expect in the readings of spring balance ? Explain your answer.

The pitch of the sound depends on

For the graph given below choose the correct option :

$\begin{array}{cc}\text{Table A}& \text{Table B}\\ a)\text{Line A}& i)\text{Accelerated Motion}\\ b)\text{Line B}& ii)\text{Constant velocity (high magnitude)}\\ c)\text{Curve C}& iii)\text{At rest}\\ d)\text{Line E}& iv)\text{Constant Velocity (low magnitude)}\end{array}$

A concave mirror is known as _____.

The number of electrons flowing in 1 second when $1A$ current flows through a wire is:

[Take charge on one electron $=1.6\times {10}^{-19}C$]

Name the mirror which is small in size, but can form a full image of a tall building.

If two people are pulling a box in the same direction with 85 N and 65 N force. Find the net work done by the forces if the net displacement of the box is 18m.

A freely suspended magnet always aligns in

What is the nature of the distance time graphs for uniform and non-uniform motion of an object ?

Define pressure. Why is it difficult to hold a school bag having a strap made of a thin and strong string? [3 MARKS]

What do you mean by zero error of a screw gauge ? How is it accounted for ?

In case of uniform circular motion,

5. two spheres A and B , each of volume 100cm3 are placed on water (density = 1 g cm-3).the sphere A is made of wood of density 0.3 g cm-3 and sphere B is made of iron of density 8.9 g cm-3.

find - upthrust on each sphere.

Newton's law of conservation of momentum???

In a bucket full of water, a block weighing $50N$ was immersed. Water weighing $5N$ is spilled out of the bucket. Calculate the buoyant force.

Distance-time graph of two objects A and B are shown below.

An auto travels the first half time with a uniform speed $u$ and the next half time with a uniform speed $v$. Find its average speed.

What is acceleration due to gravity and how is it different from acceleration?

Label the parts of the diagram.

A car A of mass $1500kg$ is travelling at $25m{s}^{-1}$ collides with another car B of mass $1000kg$ travelling at $15m{s}^{-1}$ in the same direction. After collision, the velocity of car A reduces to $20m{s}^{-1}$. Calculate the velocity of car B after the collision.

A force of $10N$ acts on a block at an angle of ${60}^{\circ }$ and because of which it moves by $10m$ on a frictionless surface. Find the work done by the force on the block.

In a uniform circular motion, which of the following is true?

A cube of density $800kg{m}^{-3}$ is floating in water. Volume of the cube is $2m^3$. Calculate the force of buoyancy acting on the body.
Density of water: ${\rho }_{water}=1000kg{m}^{-3}$

Characteristic of sound by which we can distinguish between a shrill and a grave sound is known as:-

The density of copper is 8.83 g $c{m}^{-3}$. Express it in kg $m^{-3}$.

Water is heated from $0^{\circ }C$ to ${10}^{\circ }C$. How does the density of water change with temperature ?