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#1 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE

When Mg metal is treated with hot water, it starts floating on the surface of the water. The reason for its different behaviour is :

A. Mg is a lighter element than water.

B. Mg reacts with water to produce $H_2$ gas which helps in floating.

C. Mg reacts with water to produce $N_2$ gas which helps in floating.

D. Mg reacts with water to form $CO_2$ gas which helps in floating.

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#2 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE

A student notices that her silver jewellery turned dull and had a grey-black coating over it after wearing for a few months. What results in the change in colour of the silver metal ?

A. The polish over the jewellery was removed after wearing for a few months.

B. The jewellery comes in contact with air, moisture and acids and corrodes.

C. Dust particles over the jewellery change its colour.

D. Its colour changes due to rusting.

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#3 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE

When ferrous sulphate crystals are heated in a test tube, we observe that :

A. A colourless gas with no smell is evolved.

B. A brown gas is evolved.

C. The green colour of the salt fades and a gas with the smell of burning sulphur is evolved.

D. The green colour of the salt fades and no gas is evolved.

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#4 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y ?

A. X - Sodium hydroxide, Y - Carbon dioxide

B. X - Sodium hydroxide, Y - Hydrogen

C. X - Hydrochloric acid, Y - Carbon dioxide

D. X - Hydrochloric acid, Y - Hydrogen

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#5 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE

Which of the following are combination reactions ? (i) $2KClO_3 \rightarrow 2KCl + 3O_2$ (ii) $MgO + H_2O \rightarrow Mg(OH)_2$ (iii) $4Al + 3O_2 \rightarrow 2Al_2O_3$ (iv) $Zn + FeSO_4 \rightarrow ZnSO_4 + Fe$

A. (i) and (iii)

B. (iii) and (iv)

C. (ii) and (iv)

D. (ii) and (iii)

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#6 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE

Which of the following are decomposition reactions ? (i) $2KClO_3 \rightarrow 2KCl + 3O_2$ (ii) $MgO + H_2O \rightarrow Mg(OH)_2$ (iii) $2H_2O \rightarrow 2H_2 + O_2$ (iv) $Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$

A. (i) and (ii)

B. (iii) and (iv)

C. (i) and (iii)

D. (ii) and (iv)

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#7 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

Rain water is called 'acid rain' when its :

A. pH falls below 7.2

B. pH falls below 14

C. pH is above 7

D. pH falls below 5.6

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#8 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

Baking powder is a mixture of :

A. Sodium carbonate + Acetic acid

B. Sodium carbonate + Tartaric acid

C. Sodium hydrogen carbonate + Tartaric acid

D. Sodium hydrogen carbonate + Acetic acid

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#9 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

The pH of the gastric juices released during digestion is :

A. Less than 7

B. More than 7

C. Equal to 7

D. Equal to 0

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#10 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

Which of the following compounds is used for removing permanent hardness of water ?

A. Bleaching powder

B. Washing soda

C. Baking soda

D. Caustic soda

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#11 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

Tamarind is a natural source of which acid ?

A. Acetic acid

B. Tartaric acid

C. Oxalic acid

D. Citric acid

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#12 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE

Tomato is a natural source of which acid ?

A. Acetic acid

B. Tartaric acid

C. Oxalic acid

D. Citric acid

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#13 Class 10 Science Magnetic Effects of Electric Current 2026 Long 5M CBSE

(i) (I) In the given circuit diagram, a battery $B$, a key $K$, a resistance $R$ and a thick copper wire XY are connected in series and a compass is placed near the wire. What is the purpose of this arrangement ? (II)...

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#14 Class 10 Science Magnetic Effects of Electric Current 2026 Long 5M CBSE

(i) State the rules to determine the following : (I) Direction of magnetic field produced around a current-carrying straight conductor. (II) Direction of force experienced by a current-carrying straight conductor plac...

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#15 Class 10 Science Magnetic Effects of Electric Current 2026 Long 5M CBSE

(i) Draw the pattern of magnetic field lines through and around a current-carrying circular loop. (ii) State the rule to find out the direction of the magnetic field inside and around the circular loop. (iii) Give rea...

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#16 Class 10 Science Magnetic Effects of Electric Current 2026 Long 5M CBSE

(i) State the rule which gives the direction of force acting on a current-carrying conductor placed in a magnetic field. (ii) What is a fuse ? Why is it called a safety device ? (iii) Why are electrical appliances wit...

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#17 Class 10 Science Electricity 2026 Long 5M CBSE

(i) Draw a schematic diagram of a domestic electric circuit which includes the following devices : (I) A fuse (II) A power meter (III) One light point (IV) A power plug (ii) Why is it necessary to connect an earth wir...

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#18 Class 10 Science Magnetic Effects of Electric Current 2026 Long 5M CBSE

(i) The magnetic field lines due to two bar magnets X and Y are shown in the given diagram. If the magnet X is displaced towards magnet Y, will there be repulsion or attraction between them ? Justify. (ii) A metallic ...

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#19 Class 10 Science Electricity 2026 Long 4M CBSE

Read the following passage and answer the questions that follow : Swati, a class 10 student, observes that when she passes close to the refrigerator in her kitchen, she feels the heat, although the things kept inside ...

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#20 Class 10 Science Electricity 2026 Short 3M CBSE

The values of current $I$ flowing in a given resistor for the corresponding values of potential difference $V$ applied across the ends of the resistor are given below in the table : $I$ (Amperes) 0.4 0.8 1.2 1.6 2.0 $...

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