Landowner of a village has decided to use one of his fields which had factories for several years for the production of crops. With which of the following substances does he need to treat his field for a long time to fulfill his purpose?
DBoth B and C
Lime is used to make acidic soil neutral. It is not clear from this question how the soil is acidic.
What should a car-driver do to reduce the pollution caused by his car?
ARun car on diesel instead of petrol.
BUse catalytic converter in car.
CTie plastic bag around the exhaust pipe.
DNone of these
too much to expect me to know what a catalytic converter..
Fill in the blanks.
The solubility of sugar in water ___(P)___ with an/a ___(Q)___ in ___(R)___ . However, The solubility of salt ___(S)___ very little with temperature.
P Q R S
A Decreases Increase Temperature Increases
B Increases Increase Temperature Increases
CIncreases Decrease Pressure Decreases
D Decreases Increase Pressure Decreases
i cant understand it at all
Which of these factors force the depletion of the world's natural resources?
(i) An increase in the human population.
(ii) The larger number of vehicles in use.
(iii) The greater use of biodegradable products.
(iv) More electrical appliances being used to make work easier.
(B) (i), (ii) & (iv)
(C) (ii) & (iv)
(D) (ii), (iii) & (iv).
Fill in the blanks by choosing an appropriate option. When an electric current is passed through a bulb, the __(i)__ gets so heated that it glows. The element of electric heater is made up of __(ii)__. Wires used in electric fuses break when large electric current is passed through them due to __(iii)__ effect of electric current.