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Which of the following procedures will give you water free from all impurities? (a) adding chlorine tablets (b) distillation (c) boiling (d) filtration

(b) distillation Distillation procedures will give us water free from all impurities . The distillation process removes almost all impurities... View Article

Potable water is the water which is (a) obtained from a river. (b) obtained from a lake. (c) pure and fit for drinking. (d) used only for washing clothes.

(c) pure and fit for drinking. Potable water is a water which is fit for consumption by humans and other animals. It is also called as drinking... View Article

Structures present in a cell which is responsible for determination of the sex of a baby is (a) cytoplasm (b) cell membrane (c) nucleus (d) chromosome

(d) Chromosome Sex chromosomes are different for males and females. Human cells are having two types of chromosomes: autosomes and sex... View Article

Classify the following into friendly and harmful microorganisms. Yeast, malarial parasite, Lactobacillus, bread mould, Rhizobium, Bacillus anthracis

Friendly microbes are yeasts, Lactobacillus, Rhizobium. Yeasts are used commercially for making bread and alcoholic beverages. Rhizobium is a... View Article

Preventive and control measures adopted for the storage of grains include (a) strict cleaning (b) proper disjoining (c) fumigation (d) all of the above

All of the above Godown, warehouses and stores should be properly cleaned, dried and repaired. Pathways (alleys) should be provided between... View Article

Which out of the following is not a function of vacuole? (a) Storage (b) Providing turgidity and rigidity to the cell (c) Waste excretion (d) Locomotion

d) Locomotion Vacuoles are single membrane bound cell organelles that are involved in storage, maintaining cell structure and waste excretion.... View Article

Coal is processed in industries to get some useful products. Which of the following is not obtained from coal? (a) coke (b) coal tar (c) coal gas (d) CNG

(d) CNG (Compressed Natural Gas) CNG is not obtained from coal. CNG is a fuel which can be used in replacement of diesel, petrol & LPG... View Article

Meristematic tissues in plants are (a) localised and permanent (b) not limited to certain regions (c) localised and dividing cells (d) growing in volume

(c) localised and dividing cells Growth in plants is restricted to certain regions, because the dividing cells or meristematic cells are... View Article

You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?

Wet cloths dried up because of evaporation. The rate of evaporation increases with the increase in temperature, surface area and wind speed.... View Article

In an experiment, 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

Given: Weight of fuel burnt = 4.5kg To find : Calorific value = ? The calorific value of fuel is the amount of heat produced by the complete... View Article

Involuntary actions in the body are controlled by (a) medulla in fore brain (b) medulla in mid brain (c) medulla in hind brain (d) medulla in spinal cord

c) Medulla in hindbrain Involuntary actions are under the voluntary control of the medulla oblongata which is generally referred to as the... View Article

Classify Rohu, Scolidon, Flying lizard, King Cobra, Frog, Salamander, Ostrich, Pigeon, Bat, Crocodile and Whale into the cold-blooded/warm-blooded animals.

Cold-blooded animals can be defined as animals that cannot regulate their internal body temperature with the change in the environment. They... View Article

We can survive for some time without air but we cannot survive even for a few minutes without food. State true or false. Correct if wrong statement.

False. We can survive for some time without air but we cannot survive even for a few minutes without food-Incorrect statement Correct statement:... View Article

Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school? (a) car (b) school bus (c) autorickshaw (d) scooter

Boojho if wishes to contribute in reducing air pollution while going to school should use the school bus as it avoids the combustion of fuel.... View Article

Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

Fossil fuels generate a lot of air pollution when they undergo combustion. Instead of these, we can use alternative sources of energy like:... View Article

If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Will it produce a flame?

If you hold a piece of iron wire inside the flame candle of a Bunsen burner, it will become red-hot. It will glow and its colour become red. But... View Article

Growing different crops in different seasons in the same field will deplete the soil of nutrients. State True or False. Correct the false statements.

False It enriches the soil. Farmers grow different crops in a field because different crops may vary in nutrient requirements. Three different... View Article

A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.

The boiling point of pure water is 100°C at 1atm. The freezing point of pure water is O°C. The sample of water under study boils at... View Article

In human females, each time during maturation and release of the egg the inner wall of the uterus thickens. Is this thickening permanent? Give reasons.

The thickening of the inner wall of the uterus is not permanent. It is built up after the release of a matured egg from the ovary. If... View Article

Which of the following is a pair of exhaustible natural resources? (a) coal and soil (b) air and sun-light (c) water and petroleum (d) wildlife and minerals

Wildlife and minerals are exhaustible natural resources, as they are present in limited quantity in nature and can be exhausted due to human... View Article

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