From the adjacent figure, the correct observation is:

A diver is 10 m below the surface of water. The approximate pressure experienced by the diver is-

The area of cross-section of the wider tube shown in the figure is 800 cm². If a mass of 12 kg is placed on the massless piston, then the difference in heights h of the levels of water in the two tubes will be:

The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. The ratio of density of mercury to that of air is 10⁴. The height of the hill is:

A vertical U-tube of uniform inner cross section, contains mercury in both its arms. A glycerin (density = 1.3 g/ cm³) column of length 10 cm is introduced into one of its arms. Oil of density 0.8 gm/ cm³ is poured into the other arm until the upper surfaces of the oil and glycerin are at the same horizontal level. Find the length of the oil column. [Density of mercury = 13.6 g/cm³]

The value of the coefficient of volume expansion of glycerin is 5 x 10^-4 K^-1. The fractional change in the density of glycerin for a temperature increase of 40°C will be:

When a uniform rod is heated, which of its following properties will increase as a result of it?

If two rods of length L and 2L having coefficients of linear expansion α and 2α respectively are connected so that their total length becomes 3L, the average coefficient of linear expansion of the composition of rods equals:

Two rods, one made of aluminium and the other made of steel, having initial lengths l₁ and l₂ are connected together to form a single rod of length l₁ + l₂. The coefficient of linear expansion for aluminium and steel are α_a and α_s respectively. If the length of each rod increases by the same amount when their temperature is raised by t°C, then the ratio 

A large steel wheel is to be fitted onto a shaft of the same material. At 27 °C, the outer diameter of the shaft is 8.70 cm and the wheel's central hole has a diameter of 8.69 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip on the shaft? (Assume the coefficient of linear expansion of the steel to be constant over the required temperature range and α steel = 1.20 × 10⁻⁵K⁻¹)