CBSE Class 10 Science — MCQs

The formula of functional group for aldehyde is:

Which of the following is a poor conductor of electricity?

(i) $\mathrm{AgNO_3 + NaCl \longrightarrow NaNO_3 + AgCl}$ (ii) $\mathrm{K_2SO_4 + BaCl_2 \longrightarrow BaSO_4 + 2KCl}$ Which of the following options clearly describes both the reactions?

Human brain has various parts or regions that help in different actions, responses and coordination. From the following, identify the part responsible for precision of voluntary actions:

The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:

The gases evolved on heating lead (II) nitrate crystals are:

Identify the correct statement for spirogyra, leishmania and hydra:

When you look at an object very close to your eyes, the:

Which structure in a leaf is mainly responsible for gaseous exchange?

Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings? (i) Gamete carrying X chromosome from female parent. (ii) Gamete carrying X chromosome from male parent. (iii) Gamete carrying Y chromosome from male parent.

Pancreas secretes pancreatic juice which contain certain enzyme that helps in digestion of food. Choose the correct option from the following:

Identify the type of reproduction shown in the diagram given below:

Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?

Which of the following group is not 'biodegradable'?

When an element 'X' reacts with water, it starts floating. Identify the element 'X':

A convex lens of focal length $15\mathrm{cm}$, is forming a real image. If the size of image is same as the size of object, then position of object and position of image will be, respectively:

Galvanization is a process of coating iron articles with a thin layer of zinc to prevent iron from rusting. The iron is protected even if the zinc coating is scratched and iron is exposed. Which of the following is/are true about how zinc prevents the rusting of iron? (P) A galvanised iron article does not undergo oxidation. (Q) The zinc coating prevents contact of iron with air. (R) Zinc provides continuous protection to iron from rusting.

Four solutions, namely fructose, ethanol, hydrochloric acid and sodium hydroxide filled in four separate beakers are connected one by one in an electric circuit with a bulb. The solutions in which the bulb will glow when current is passed are:

Rays from the sun converge at a point 25 cm behind a convex lens. The distance at which an object be placed in front of the lens to get a virtual image, is:

An ecosystem contains maximum number of:

Select the incorrect statement from the following:

Study the following table and select the correct option:

Magnesium ribbon burns with a dazzling white flame and changes into a white powder as shown in the diagram. The powder is dissolved in water. Identify the chemical formula of the white powder and the correct change observed when the solution is tested with litmus paper.

The reasons for excessive generation of wastes are: (i) Use and throw policy. (ii) Increased availability of packaged food. (iii) Increased construction wastes. (iv) Non-sorting of dry and wet wastes. Select the correct combination of options.

In the following diagram, if acetic acid of same concentration is taken in place of dilute sulphuric acid, then

Which of the following will not undergo addition reaction?

Identify the part that controls the closing and opening of the stomatal pore in leaves of plants. Select the correct option.

Assertion (A): Reaction of quick lime with water is an exothermic reaction. Reason (R): A large amount of heat is evolved on the reaction of quick lime and water.

Study the following table and select the correct option: Salt | Acid used | Base used | Nature of Salt (A) NaCl | HCl | NaOH | Basic (B) $Na_2CO_3$ | $H_2CO_3$ | NaOH | Neutral (C) $Na_2SO_4$ | $H_2SO_4$ | NaOH | Acidic (D) $CH_3COONa$ | $CH_3COOH$ | NaOH | Basic

Assertion (A): Bacteria produced as a result of asexual reproduction would be similar. Reason (R): There would be only minor differences between the bacteria generated due to small inaccuracies in DNA replication.

Assertion (A): The peristaltic movements occur all along the gut. Reason (R): The lining of the gut has muscles that contract rhythmically to push the food in regulated manner.

When a human egg is fertilized by a sperm having 'Y' chromosome, the zygote has the following combination of chromosomes:

Choose the equation of reaction that correctly represents anaerobic respiration in muscles:

Yeast multiplies by which of the following methods?

On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?

Which of the following is an amphoteric oxide?

To restore clear vision in persons whose size of the eye ball has reduced, he/she is suggested to use suitable

Rays from the sun converge at a point $25\text{ cm}$ behind a convex lens. The distance at which an object be placed in front of the lens to get a virtual image, is:

Which of the following set of compounds does not belong to same homologous series?

Which of the following is a non-biodegradable pollutant?

Assertion (A): The needle of a magnetic compass kept in strong external magnetic field, always aligns itself in north-south direction on the earth. Reason (R): Behaviour of the needle of a compass is same as that of a freely suspended bar magnet.

The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

In human beings, the implantation of fertilised egg takes place in which part of female reproductive system?

The part of human eye which controls the amount of light entering into it is:

You have three aqueous solutions A, B and C as given below: A - Potassium nitrate, B - Ammonium chloride, C - Sodium carbonate. The ascending order of the pH of these solutions is:

Consider the following food chain: Grass -> Grasshopper -> Frog -> Snake -> Eagle. If the amount of energy available at third trophic level is $50 \text{ kJ}$, the available energy at the producer level was:

Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called:

In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the electrodes R and S, then select the option/options in which the matching is correct: (i) P-Oxygen gas R-Anode (ii) P-Hydrogen gas R-Cathode (iii) Q-Hydrogen gas S-Cathode (iv) Q-Oxygen gas S-Anode

Assertion (A): In the common domestic circuits the earth wire is connected to a metallic plate buried deep inside the earth. Reason (R): Earth wire ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, so the user may not get a severe electric shock.

Assertion (A): Carbon and its compounds are our major sources of fuels. Reason (R): Most of the carbon compounds on burning release a large amount of heat and light.

Assertion (A): Food web is a network of several food chains operating in an ecosystem. Reason (R): Food web decreases the stability of an ecosystem.

Assertion (A): Xylem tissue moves water and minerals obtained from the soil by the roots. Reason (R): Xylem tissue is found only in the roots of a plant.

Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:

In human alimentary canal, the digestive juice secreted by the gastric glands are:

The basic filtration unit of the excretory system in human beings is:

The incorrect statement about ozone is:

The water of crystallization is present in: (i) Bleaching Powder (ii) Plaster of Paris (iii) Washing Soda (iv) Baking Soda

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The $F_1$ generation will be:

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is:

A pair of endocrine glands located in the human brain is:

Select from the following a statement which is not true about burning of magnesium ribbon in air:

A Hydrocarbon which does not belong to the same homologous series of carbon compounds is:

Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II: Column I: P. Leishmania, Q. Spirogyra, R. Planaria, S. Plasmodium Column II: 1. Regeneration, 2. Multiple Fission, 3. Binary Fission, 4. Fragmentation, 5. Budding

Assertion (A) : The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. Reason (R) : Placenta is a disc which is embedded in the uterine wall.

Assertion (A) : Silver chloride turns grey in sunlight. Reason (R) : Decomposition of silver chloride into silver and chlorine takes place by sunlight.

Assertion (A) : The pattern of the magnetic field of a solenoid carrying a current is similar to that of a bar magnet. Reason (R) : The pattern of the magnetic field around a current carrying conductor is independent of the shape of the conductor.

The examples of natural and manmade (artificial) ecosystems are respectively

The possible way to restore clear vision of those people whose eyeball has elongated is the use of suitable

Human activities that are affecting the environment are :

Assertion (A) : All organisms can make organic compounds like sugar and starch from inorganic substances using radiant energy of the sun. Reason (R) : The organisms which can produce food by photosynthesis are called producers.

The plant hormones promoting rapid cell division in seeds and wilting of leaves respectively are

In aerobic respiration, the steps are : breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both processes respectively occur in -

In order to obtain large images of the teeth of patients, the dentist holds the concave mirror in such a manner that the teeth are positioned

The main observations while performing the experiment of burning magnesium ribbon in air are : (i) Magnesium ribbon burns with a dazzling white flame. (ii) A white powder is formed. (iii) Magnesium ribbon vapouriess. (iv) Aqueous solution of the white powder turns blue litmus to red.

Which among the following is not a neural action controlled by the part of human brain labelled 'X' in the figure above?

Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps : (i) Diffusion of simple nutrients into cytoplasm (ii) Food vacuole formation (iii) Formation of finger like temporary extensions of cell surface (iv) Complex substances broken to simpler ones (v) Undigested material thrown out of the cell surface

A metal, M, displaces iron from aqueous solution of ferrous sulphate but fails to do so in case of aqueous solution of aluminium sulphate. The metal M is

The modes of reproduction in Spirogyra and Planaria respectively are

If we make carbon skeleton with four carbon atoms, the two different possible skeletons will be

A metal, 'X', on treatment with sodium hydroxide liberates a gas 'G'. It also liberates the same gas, 'G' on treatment with dilute sulphuric acid. Based on above information, 'X' and 'G' respectively are

The values of a, b, c and d in the following balanced chemical equation are respectively: $a Pb(NO_3)_2 \xrightarrow{heat} b PbO + c NO_2 + d O_2$

A common feature observed in the crystals of washing soda, copper sulphate, gypsum and ferrous sulphate is that all

During electrolytic refining of copper, the anode, the cathode and the electrolyte used respectively are

In which one of the following situations a chemical reaction does not occur?

Assertion (A): When ciliary muscles contract, eye lens becomes thin. Reason (R): Ciliary muscles control the power of the eye lens.

Assertion (A): In large animals, oxygen can reach different parts of the animal's body easily. Reason (R): Respiratory pigments take up oxygen from the air and carry it to body tissues.

Assertion (A): Concentrated nitric acid is diluted by adding water slowly to acid with constant stirring. Reason (R): Concentrated nitric acid is easily soluble in water.

In the food chains given below. Select the most efficient food chain in terms of energy :

Which one of the following gets biomagnified at different levels in a food chain?

Assertion (A): In reptiles, the temperature at which the fertilized eggs are kept decides the sex of the offsprings. Reason (R): Sex is not genetically determined in some animals.

In order to prepare dry hydrogen chloride gas in humid atmosphere the gas produced is passed through a guard tube (drying tube) which contains :

To get an image of magnification $-1$ on a screen using a lens of focal length $20\text{ cm}$, the object distance must be :

An optical device 'X' is placed obliquely in the path of a narrow parallel beam of light. If the emergent beam gets displaced laterally, the device 'X' is :

In a bisexual flower the male gametes are present in the :

When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in $F_1$ and $F_2$ generation pea plants will be respectively :

A piece of wire of resistance 'R' is cut lengthwise into three identical parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the value of R/R' is :

Select TRUE statements about lymph from the following : A. Lymph vessels carry lymph through the body and finally open into larger arteries. B. Lymph contains some amount of plasma, proteins and blood cells. C. Lymph contains some amount of plasma, proteins and red blood cells. D. Lymph vessels carry lymph through the body and finally open into larger veins. The true statements are :

Plants like rose and banana have lost the capacity to produce :

An electric bulb is rated $220\text{ V}; 11\text{ W}$. The resistance of its filament when it glows with a power supply of $220\text{ V}$ is :

The property by virtue of which a solid material can be drawn into thin wires is called :