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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

A bullet of mass 10 g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.

Answer: Given parameters, Initial velocity (u) = 150 m/s Final velocity (v) = 0 (since the bullet finally comes to rest) Time taken to come to... View Article

A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force (b) the acceleration of the train (c)the force of wagon 1 on wagon 2.

Answer: Given parameters Mass of the engine (M) = 8000 kg Number of wagons = 5 Mass of the wagons (m) = 2000 kg Force exerted by the engine... View Article

Which of the following correctly represents the order of trophic levels? i) Producer, Primary consumer, Secondary consumer, Tertiary consumer ii) Primary consumer, Secondary consumer, Tertiary consumer iii) Producer, Secondary consumer, Primary consumer, Tertiary consumer iv) None of the above

Producer, Primary consumer, Secondary consumer, Tertiary consumer... View Article

Which of the following is a characteristic of living things? a. Living organisms are highly organized, coordinated structures that consist of one or more cells b. Living things respond to diverese stimuli c. All organisms use a source of energy for their metabolic activities. d. All of the above

All of these... View Article

Which of the following is not a feature shown by sponges? i) Sponges lack tissues and body symmetry. ii) Sponges belong to phylum Porifera. iii) Sponges are mainly found in marine habitats, but some may also be found in freshwater bodies. iv) Swimming is possible for the sponge larvae as they have cilia.

The correct option is: iii) Sponges are mainly found in marine habitats, but some may also be found in freshwater bodies.... View Article

Identify the right option describing the seeds present in Gymnosperms. i) The root system of gymnosperms is very complex. ii) In Gymnosperms, seeds are naked and not enclosed in seeds. iii) The gymosperms can survive habitats which includes marine too. iv) The fruits of the gymosperms are developed from the seeds.

In Gymnosperms, seeds are naked and not enclosed in seeds... View Article

Which of the following is not a property of a gas? i) The gases have very high compressibility. On applying pressure, gas molecules come closer and decreases the volume of a gas. ii) Gases can expand to fill the containers. iii) Gases have a specific shape or volume. iv) They are less denser than solids or liquids.

Option (iii) Gases have a specific shape or volume. The gases have very high compressibility. On applying pressure, gas molecules come closer... View Article

Choose the option that does not describe the property of a metallic solids: i) Metallic solids are good conductors of electricity. ii) There are metallic bonds present in these atoms that are holding them together. iii) Metallic solids can have high melting points. iv) Metalic solid is not a subcategory of crystalline solid

The correct option is iv) Metalic solid is not a subcategory of crystalline solid... View Article

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be €“ Option A: 1:2 Option B: 2:1 Option C: 1:4 Option D: 4:1

The correct answer is option C 1:4 Answer Heat produced in the circuit is inversely proportional to the resistance R. Let RS be the equivalent... View Article

Choose the property which is not applicable to an element: i) Atomic radius decreases from left to right ii) Electronegativity decreases from top to bottom iii) Element is a pure substance which cannot be broken down into two or more simpler substances by any physical or chemical process iv) Electronegativity increases from left to right

Element is a pure substance which cannot be broken down into two or more simpler substances by any physical or chemical process.... View Article

Investigate: Use strip and fasteners to make a triangle and a quadrilateral. Try to push inward at any one vertex of the triangle. Do the same to the quadrilateral. Is the triangle distorted? Is the quadrilateral distorted? Is the triangle rigid? Why is it that structures like electric towers make use of triangular shapes and not quadrilateral?

O is common to both the angles ˆ AOC and ˆ BOC. No, the triangle is not distorted but the quadrilateral is distorted and also the triangle is... View Article

A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will a. keep oscillating with old time period b.keep oscillating with smaller time period c.keep oscillating with larger time period d.come to rest rapidly

A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the... View Article

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