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State the purpose of ratchet in a screw gauge.

Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.

Sound having loudness above 80dB is called ___

Two miscible fluids of densities 1.2 gm/cm³ and 1.4 gm/cm³ are mixed with a proportion of their volumes equal to 3: 5. Assuming both fluids to be perfectly miscible, what is the density of resulting liquid?

Calculate the density and the relative density of a ball of mass $500g$ and volume $100c{m}^3$. (Take the density of ​water, ${\rho }_w=1,000kg{m}^{-3}$)

(a) State Newton’s third law of motion and give two examples to illustrate the law.
(b)Calculate the force required to produce :
(i) an acceleration of 2.5 m/s2 in a body of 4 kg
(ii) an acceleration of 3.0 m/s2 in a body of 10 kg.

A spring balance

Why sometimes we take 10 m/s^2 as the value of small g?

When a branch of a tree is shaken vigorously ,some leaves drop down. Give reason.

In the given figure of a hydraulic lift, the narrow piston area is 6 $c{m}^2$ and the wide piston area is 60 $c{m}^2$. Find the force required to lift the block if the weight of the block, w is 1200 N.

A bullock is pulling a cart. The cart moves. There is a force on the cart and the cart has moved. Do you think that work is done in this situation?

My doubt is ....If a substance is soluble in water then is it necessary that it will be insoluble in oil ???

when my mother boils water in open kettle and i try to see through the vapours coming out from the kettle.the things on the other side of the vapours coming out of the kettle appears to be blur.why this happens???

If a car increases its speed by unequal amounts in equal interval of time, then the car is said to be moving with

A stone dropped from the top of a building, takes 4 seconds to reach the ground. Find the height of the building.

1 gram force equals___dyne.

(acceleration due to gravity $g=9.8\frac{m}{s^2}$)

A beaker is filled with water to its brim. A ball of mass 1 kg is slowly dropped into it. If water weighing 5 N falls out of the beaker, the buoyant force experienced by the ball is ___.

Which of the following are zodiacs?

At the maximum height if a bodyis thrown vertically up its ----------------------------------

An object weighing 5 N in air, weighs 4.5 N in a liquid. The buoyant force experienced by the object is :

Which graph represents the variation of surface tension with temperature over small temperature ranges for water

In which malayalam month does "Thiruvathira njattuvela" occur?

A man of mass 60 kg stands on a weighing machine of area 225 cm². The pressure exerted by him is: Take g = 10 m/s2.

$\begin{array}{cccc}& \text{Column A}& & \text{Column B}\\ \text{(a)}& \text{A stone at a height}& \text{(i)}& \text{power}\\ \text{(b)}& \text{A moving ball}& \text{(ii)}& \text{joule}\\ \text{(c)}& \text{Energy}& \text{(iii)}& \text{work done in 1 sec}\\ \text{(d)}& \text{Power}& \text{(iv)}& \text{potential energy}\\ \text{(e)}& \text{watt}& \text{(v)}& \text{kinetic energy}\end{array}$

Why ships don't sink in water?

The resistance of a metal wire of length 1m is 26 ohm. If diameter of wire is 0.3mm what will be the resistivity of the metal at that temperature.

Which one is correct for the slope of velocity-time graph?

The odometer of a car reads 3000 km at the start of a trip and 3400 km at the end of the trip. If the trip took 8 hours, calculate the average speed of the car in km $h^{-1}$.

The commercial unit of energy is__.

A 1500-kg car rests on four tires, each of which is inflated to a gauge pressure of 200 kPa. If the four tires support the car's weight equally, what is the area of contact of each tire with the road?

Which of the following is not true about viscosity?

The potential energy of a body of mass 0.5 kg increases by 100 J when it is taken to the top of a tower from ground. If force of gravity on 1 kg is 10 N. what is the height of the tower ?

Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 volt.

Which of the following is an example of motion in three dimensions?

(a) When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.

(b) How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

A stone of 1 kg is thrown with a velocity of $20\frac{m}{s}$ across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

What does the slope of a distance-time graph indicate?

Write an expression for the kinetic energy of a body of mass m moving with a velocity v.

A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the truck or on the bicycle ? Give a reason to support your answer.

Which of the following statement is correct?

A vernier callipers has 25 divisions on its vernier scale for every 35 divisions on its main scale. If 1 cm on the main scale is split into 12 units, the least count of the callipers will be

An iron block has a length of $20cm$, breadth of $10cm$ and height of $5cm$. Its volume is:

A boy runs for 10 minutes at a speed of 18km hr. At what speed should he run for the next 20 minutes so that the average speed becomes 12 km hr

If a child hears an echo from a cliff 6 second after the sound is produced by shouting, how far is the cliff? Take speed of sound to be 343.33 ~m/s

An up escalator is going at the rate of 10 step/min. How many steps should I move down on it as to look like that I am at rest to a person standing on ground.

A body of mass 2kg is traveling with a uniform velocity of 10m/sec. What is its momentum? This body collides with another body of equal mass travelling in the same direction with a velocity of 5m/sec. What is the total momentum of the bodies before and after collision?

Which of the following is/are correct statements:-