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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

Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material? (a) Silver (b) Copper (c) Sulphur (d) Aluminium

(c) Sulphur Materials which can be drawn into wires are called ductile. Sulphur is brittle. We cannot obtain thin sheets by beating non -metals.... View Article

Name the target organs for the following diseases (a) Hepatitis targets. (b) Fits or unconsciousness targets . (c) Pneumonia targets . (d) Fungal disease targets .

(a) Liver Hepatitis causes scarring of the liver (cirrhosis). (b) Brain A seizure, also known as a fit, is caused by a disturbance in the... View Article

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well-labelled diagram.

Naphthalene is insoluble in water but soluble in ether an organic solvent. It is volatile at room temperature Ammonium chloride is soluble in... View Article

Which of the following feature will help you in distinguishing a plant cell from an animal cell? (a) cell wall (b) cell membrane (c) mitochondria (d) nucleus

a) Cell wall The cell is the fundamental unit of life. All the life activities are carried out by cells. Both plant and animal cells comprise... View Article

In coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

In coastal areas, during daytime, there is a regular flow of cool air from the sea towards the land. At night, there is a reverse flow of air... View Article

Which of the following is a recently originated problem of environment? (a) Ozone layer depletion (b) Greenhouse effect (c) Global warming (d) All of the above

d) All of these Ozone layer depletion The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone... View Article

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