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If water is cooled from 4∘C to 0∘C. Which of the following conditions will be true for water.

3 kg of coal liberates 6000 kJ of heat on combustion. Find its calorific value.2000

2.what is the effect of applied electric and magnetic field on an ionised gas?

Why earth is called as a gigantic magnet

ntA planet of mass m revolves around the sun of mass M In an elliptical orbit such that it's maximum separation from sun is 'a' and minimum separation is 'b'. Find the maximum orbital speed of the planet.n

Select the correct option:

Define 1 joule of work

A car travels on paths A, B, and C within the same time duration and has average velocities vA,vB, and vc, respectively. These paths pass through a group of equally spaced lines. Identify the average velocities of the car in the respective order.

Due to the spherical shape of the earth the speed of rotation _____________ towards the poles.

A biker reduces the speed from 72 kmhr−1 to 36 kmhr−1 in 6 s. Calculate the acceleration in this case.

A particle of mass 1 kg is whirled in a horizontal circle of radius 1 metre with the help of a light string . What is the magnitude of the vector sum of all the forces acting on the particle when the speed of the particle is 5m/s?

8) The bob of a 0.2 m pendulum describes an arc of circle in a vertical plane. If the tension in the cord is \sqrt3 timesthe weight of the bob when the cord makes an angle 30^° with the vertical, the acceleration of the bob in that position is a)g;b)g/2;c)\sqrt{3 } g/2;d)g/

a planet has three times the mass and double the radius of earth. what will be the height above the surface of planet where its acceleration due to gravity reduces by 19% of its value on its surface

hypothetical planet has density p radius R, andsurface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet's surface would be. A. If the radius of(1) 4g(3) g (2)2g (4)g/2

Which of the following is used in optical fibres?

Which of the following constitute a food chain?

A car travelling at a speed of 30 km/h is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/h, it can be brought to a halt with the same braking force in:

32. An aeroplane is flying with speed V m/sec. The area of the cockpit window is A square Metre. What is the force per unit area of the cockpit window?

n identical cells are joined in series with its two cells A and B in the loop with reversed polarities. Emf of each cell is E and internal resistance r. The potential difference across cell A or B is (Here n &gt; 4)

3. What is the ratio of velocities of electron in 2nd and 4th orbit of H atom

The wavelength of waves produced by a source is 50 cm. If wave velocity is 25 ms−1, what is the time required for one wave to generate?

What is the difference between mass and weight of an object. Will the mass of an object on the earth be same as their values on Mars? And why??

A simple U tube contains mercury to the same level in both of its arms. If water is poured to a height of 13.6 cm in one arm,how much will be the rise in the mercury level in other arm? Given : density of mercury = 13.6×10³ kg m-³ and density of water = 10³ kg m-³

A ball of radius r and density Ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is h, the value of h is given by

Masses kept at the corners of a regular pentagon as shown. Dis†an ce between centroid and any vertex of Pentagon is R. If another point mass m0 is kept at the centroid of the Pentagon then force acting on it due to Masses is?

Find the reading of the ammeter(A) as shown in the figure.

If two identical spheres are having charge 16*10^-6 C and -8*10^-6 C are kept at certain distance apart then the force is F.They are touched and again kept at the same distance,the force becomes ____________.

Starting from stationery position Anil paddles his bicycle to attain a velocity of 10 m/s in 25 sec. Then he applies breaks such that he again comes to rest after next 5 secs. Calculate the acceleration of bicycle in both cases. Also, find the total distance covered.

From the top of a tower of height 20 m, two balls are projected, one with speed 20 m/s at an angle of 30° with horizontal in upward direction and second with speed 20 m/s at an angle of 30° with horizontal in downward direction. Distance between the balls, when they land on the ground is

1 calorie = __ joule

How much work is done in moving a charge of 10 C across two points having a potential difference 24 V?

The radius of earth is about 6400 Km and that of mars is 3200 Km the mass of the earth is about 10 times the mass of mars an object weighs 200N on the surface of earth its weight on the surface of mars will be

ACCORDING TO NEWTON'S THIRD LAW OF MOTION, WHY (F=-F) ?

29.A,B,C,D,P & Q are points in a uniform electric field. The potentials at these points are V(A)= 2V. V(P)=V(B)=V(D)=5V, and V(C) =8V . Find the electric field at P.

The diameter of moon is 3.5 x 10^3km.and its distance from earth is 3.8 x 10^5 km. It is seen by a telescope having focal lengths of objective and eye piece as 4 m and 10 cm respectivelyThe diameter of the image of the moon is nearly

45. Which of the following sets of displacements might be capable of returning a car to its starting point? ( a) 4, 6, 8, and 15 km. (b) 10, 30, 50 and 120 km. (c) 5, 10, 30, and 50 km. (d) 50, 50, 75 and 200 km.

Question 14What does CNG stand for and why is it considered to be a better fuel than petrol?

How can we prepare a hydraulic jack modle for our physics project ? Please

why some reaction are irreversible and cannot proceed in backward direction?eg . KClO3 => KCl + O2

Observe the vessels A, B, C and D shown in the figure given below.Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.

The wavelength of light in two liquids x and y is 3500 A∘ and 7000 A∘, then the critical angle of x relative to y will be______.

A current carrying closed loop right angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB if the magnetic force on the arm BC is F the force arm AB

Short note on echo.

Convert100 joule into a new system whose basic units are 1000 g 10 m and 10 minutes

Derive the relation between kinetic energy and momentum. [3 MARKS]

n identical cells are joined in series with its two cells A and B in the loop with reversed polarities. Emf of each cell is E and internal resistance r. The potential difference across cell A or B is (Here n > 4)

If two identical spheres are having charge 1610^-6 C and -810^-6 C are kept at certain distance apart then the force is F.They are touched and again kept at the same distance,the force becomes ____________.