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Which of the following is a feature of primitive subsistence farming? i) More labour requirement in the field ii) Crop rotation is practiced in few areas iii) Low land productivity iv) There is a permanent dwelling spot occupied by the community

Low land productivity... View Article

Choose the option which is not a property of metal: i) Metal is a good conductor of heat. ii) Except for mercury all the other metals are in liquid state. iii) Metals form cations in aqueous solution. iv) The oxides of metals are basic in nature.

ii) Except for mercury all the other metals are in liquid state. This is the correct option because mercury exist in liquid state and all other... View Article

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image.

Given that u = - 27 cm f = - 18 cm h0 = 7.0 cm Find out We need to find out size and nature of image Formula We know the mirror formula... View Article

Draw any line segment, say . Take any point C lying in between A and B. Measure the lengths of AB, BC and AC. Is AB = AC +CB? [Note: If A, B, C are any three points on a line, such that AC + CB = AB, then we can be sure that C lies between A andB.]

Since given that point C lie in between A and B. Hence, all points are lying on the same line segment AB. Therefore for every situation in which... View Article

A person needs a lens of power -5.5 dioptre for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?

The power P of a lens of focal length f is given by the relation P= 1/f (i) Power of the lens used for correcting distant vision = - 5.5 D Focal... View Article

Which of the following characteristics is associated with gaseous state? a. Fixed Shape, Incompressible, Packed Closely b. Incompressible,Fixed Shape and Size c.definite shape, compresible and fixed volume d. no fixed shape and size, highly compressible

Gases do not have a fixed shape and size. They are highly compressible. Gases are fluid and flow easily. Gases have neither... View Article

Which of the following is not the characterstic of the image obtained from the plane mirror: i) The size of the image is bigger than the object ii) The final image obtained is erect iii) The image has a lateral inversion iv) The image obtained is virtual

The correct option is i) The size of the image is bigger than the object... View Article

Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m/s before the collision during which they stick together. What will be the velocity of the combined object after collision?

Given that Mass of one of the objects,m1 = 1.5 kg Mass of the other object, m2 = 1.5 kg Velocity of m1 before collision, u1 = 2.5 m/s... View Article

Which is a correct rule of writing names in binomial nomenclature? i) The entire two part name must be written in Italics ii) The genus name is written in the second half of the name iii) The genus name should not be written in capital iv) All of the above

The correct option is i) The entire two part name must be written in Italics... View Article

In each of the following pairs of numbers, state which whole number is on the left of the other number on the number line. Also write them with the appropriate sign (greater than, less than) between them. (a) 530, 503 (b) 370,307 (c) 98765, 56789 (d) 9830415,10023001

(a) 530 > 503 So 503 appear on left side of 530 on a number line. (b) 370 > 307 So 307 appear on left side of 370 on a number line. (c)... View Article

Which one of the following is an example of decomposition reaction? a.AgCl †’ 2 Ag + Cl₂ b. CH₄ + 2O₂ → CO₂ +2 H₂O c. CaCO₃ + heat → CaO + CO₂ d. Fe + CuSO₄→ FeSO₄ + Cu

In decomposition reactions, a single reactant decomposes to form two or more products.2 AgCl †’ 2 Ag + Cl2... View Article

Which of the following is not a feature of the earthworm? i) Earthworms have a streamlined and segmented body. ii) For easy movement through the soil, earthworms release mucus. iii) They have open circulatory system iv) Earthworms are sensitive to vibrations and light.

The correct option is iii) They have open circulatory system... View Article

Which of the following is not a physical property of water? i) Water is a colourless and tasteless liquid. ii) On increasing pressure the freezing point of water decreases. iii) Water has higher specific heat and thermal conductivity. iv) As solvent, water is excellent.

On increasing pressure the freezing point of water decreases.... View Article

Select the wrong statement from the given options: i) These compounds are not inert in nature ii) These compounds have high melting points iii) The hardness of these compounds are compared with diamonds iv) The conductivity of these compounds are sililar to their parent metals

Interstitial compounds are chemically inert thus they are not highly reactive.... View Article

The speed-time graph for a car is shown is below figure a) Find out how far the car travels in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period. (b) Which part of the graph represents uniform motion of the car?

Answer: In velocity - time graph, distance is equal to the area of the velocity - time graph. Let us find the approximate area of using the... View Article

Which of the following is not an advantage of separating wastes? i) Recycling of waste leads to conservation of energy. ii) Dumping of waste in landfills leads to contamination of soil. iii) Helps in reducing the pollution. iv) Spreads awareness about enivornment friendly products.

The correct option is ii) Dumping of waste in landfills leads to contamination of soil.... View Article

Which of the following is not a function of golgi apparatus?i) Golgi apparatus helps in modifying proteins and lipids. ii) They secrete mucus. iii) They help in transporting products into vesicles. iv) Detoxification of poisons and drugs is a function of smooth endoplasmic reticulum

Detoxification of poisons and drugs is a function of smooth endoplasmic reticulum... View Article

Where should an object is placed in front of a convex lens to get a real image of the size of the object? Option A: At the principal focus of the lens Option B: At twice the focal length Option C: At infinity Option D: Between the optical centre of the lens and its principal focus.

Correct Option: B Solution: At twice the focal length That image is at the centre of curvature. The distance between pole and centre of... View Article

Which of the following is not a characteristic of epithelial tissue? (1) Epithelium tissue has the capability of regeneration. (2) epithelial tissue cells lie on a basement membrane. (3) The basement of the tissue is non-cellular, supporting the underlying structures. (4) None of the above

Answer: (4) None of the above Epithelial tissue or epithelium forms the outer covering of the skin and also lines the body cavity. It forms the... View Article

Which features adapt polar bears to live in extremely cold climate?Option A: A white fur, fat below skin, keen sense of smell. Option B: Thin skin, large eyes, a white fur. Option C: A long tail, strong claws, white large paws. Option D: White body, paws for swimming, gills for respiration.

Answer option (a) A white fur, fat below skin, keen sense of smell Adaptation refers to the change in the structure and the function of an... View Article

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