Which one of the following has the highest calorific value

Which one of the following has the highest calorific value?

1. kerosene
2. biogas
3. LPG
4. petrol

Iron rim is made slightly smaller than the wooden wheel

Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim

1. expands and fits onto the wooden wheel.
2. contracts and fits onto the wooden wheel.
3. no change in the size takes place.
4. expands first, then on cooling contracts and fits onto the wooden wheel.

Salt can be separated from its solution because

Salt can be separated from its solution (salt dissolved in water), because

1. mixing of salt in water is a change that can be reversed by heating and melting of salt.
2. mixing of salt in water is a change that cannot be reversed.
3. mixing of salt in water is a permanent change.
4. mixing of salt in water is a change that can be reversed by evaporation.

Which can be separated by the method of winnowing

Four mixtures are given below

1. Kidney beans and chick peas
2. Pulses and rice
3. Rice flakes and corn
4. Potato wafers and biscuits

Which of these can be separated by the method of winnowing?

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (iii) and (iv)

Which methods would be most appropriate to separate grains from bundles of stalks

Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?

1. Hand picking
2. Winnowing
3. Sieving
4. Threshing

Which mixtures would you be able to separate using the method of filtration

Which of the following mixtures would you be able to separate using the method of filtration?

1. Oil in water
2. Cornflakes in milk
3. Salt in water
4. Sugar in milk

Which materials is not lustrous

Which of the following materials is not lustrous?

1. Gold
2. Silver
3. Wood
4. Diamond

An iron nail is kept in each of the following liquids

An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

1. Mustard oil
2. Soft drink
3. Coconut oil
4. Kerosene