MODEL PAPER 1 — Science STD 10 — Question

The non-renewable source of energy among the following is:

When dilute sulphuric acid is added to pieces of iron sulphide, hydrogen sulphide gas is produced and soluble ferrous sulphate is formed. The type of chemical reaction involved is :

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was :

The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys:

Copper displaces which of the following metals from its salt solution :

The energy in the reactor of a nuclear power station is produced by the process of:

Which of the following statements is correct about receptors?

Characters that are transmitted from parents to off spring during reproduction show :