Machines — Physics STD 10 — Question

A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.

A radio set of 60 W runs for 50 hours. How much electrical energy is consumed? Give your answer in kWh.

Some heat is given to 120 g of water and its temp. rises by 10 K. When the same amount of heat is given to 60 g of oil, its temp. rises by 40 K. The Sp. heat of water is 4200 J/kgK. Calculate:
(a) The amount of heat in joules given to water,
(b) The specific heat capacity of the oil.

Under what circumstances does one get an electric shock from an electrical gadget?

In an experiment. 17 g of ice is used to bring down the temp. of 40 g of water from 34°C to its freezing point. The sp. heat capacity of water is 4.25 J/g°C. Calculate sp. latent heat of ice.

Distinguish between work and power.

State the function of the following in a house circuiting
kWh meter .

What is sonar? State the principle on which it is based.

What is the principle of method of mixture (or principle of calorimetry)? Name the law on which
this principle is based.