The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

Heat is supplied uniformly at the rate of 100W to 1.0 x 10^-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5^oC, then the specific heat capacity of the liquid is

Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is p while the pressure on H is P, If the atmospheric pressure is equivalent to 10m of water, then the value of P/P is?

In which of the following diagrams is the length of the tube equal to one wavelength?

Which of the following statements about radioactivity is true?

(i) Alpha particle is positively charged

(ii) Beta particle is negatively charged

(iii) Gamma ray is neutral

(iv) Beta particle has the same mass as helium atom

(v) Gamma ray is charged.

The fiqure below represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

In the figure, the value of R is

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10⁸m/s, the velocity of light in the liquid is

The physical properties of soil include the following except