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#1 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE
Which one of the following chemicals is used in soda-acid fire-extinguishers?
A. Sodium carbonate
B. Sodium hydrogen carbonate
C. Sodium hydroxide
D. Sodium acetate
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#2 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE
Solder is an alloy of:
A. copper and zinc
B. lead and zinc
C. lead and tin
D. copper and tin
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#3 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE
Which one of the following metals neither reacts with cold water nor reacts with hot water but reacts with steam?
A. Sodium
B. Calcium
C. Iron
D. Magnesium
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#4 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE
When lead nitrate is heated in a boiling tube, we observe:
A. brown fumes of $O_2$ gas
B. white fumes of $NO_2$ gas
C. yellow fumes of lead oxide
D. brown fumes of $NO_2$ gas
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#5 Class 10 Science Carbon and its Compounds 2026 Long 1M CBSE
Assertion (A): Pure ethanoic acid is also known as glacial acetic acid. Reason (R): Pure ethanoic acid often freezes during winter due to its low melting point of 290 K. Select the correct option.
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#6 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE
How will you protect yourself from the heat generated while diluting a concentrated acid?
A. By adding acid to water with constant stirring.
B. By adding water to acid with constant stirring.
C. By adding water to acid followed by base.
D. By adding base to acid with constant stirring.
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#7 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE
Alloys are homogeneous mixture of metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
A. Brass
B. Bronze
C. Amalgam
D. Steel
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#8 Class 10 Science Metals and Non-metals 2026 Mcq 1M CBSE
Which one of the following metals does not react with cold water?
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
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#9 Class 10 Science Carbon and its Compounds 2026 Mcq 1M CBSE
While washing dirty clothes by soap, micelles are formed. Select the correct statement about micelles.
A. The hydrophobic tail of the soap molecule is in the interior of the cluster, whereas hydrophilic end is on the surface of the cluster.
B. The hydrophobic tail is on the surface of the cluster, whereas hydrophilic end is in the interior of cluster.
C. Both hydrophobic tail and hydrophilic end are in the interior of the cluster.
D. Both hydrophobic tail and hydrophilic end are on the surface of the cluster.
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#10 Class 10 Science Acids, Bases and Salts 2026 Mcq 1M CBSE
An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change?
A. Sodium hydroxide
B. Hydrochloric acid
C. Baking soda
D. Slaked lime
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#11 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE
$$C_6H_{12}O_{6(aq)} + 6O_{2(g)} \longrightarrow 6CO_{2(g)} + 6H_2O_{(l)}$$ The above reaction is an example of:
A. Displacement Reaction
B. Endothermic Reaction
C. Exothermic Reaction
D. Neutralisation Reaction
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#12 Class 10 Science Chemical Reactions and Equations 2026 Mcq 1M CBSE
The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is
A. 1 : 1
B. 2 : 1
C. 4 : 1
D. 1 : 2
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#13 Class 10 Science Electricity 2026 Short 5M CBSE
(i) Define electrical resistivity of a material. (ii) How will the resistivity and resistance of a conducting wire change if the length and area of cross-section of wire both are doubled? Justify your answer. (iii) Ca...
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#14 Class 10 Science Electricity 2026 Short 5M CBSE
[Figure: Three resistors $R_1 = 2\ \Omega$, $R_2 = 4\ \Omega$ and $R_3 = 6\ \Omega$ are connected in parallel between points X and Y. A voltmeter V is connected across the combination and the combination is connected ...
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#15 Class 10 Science Light - Reflection and Refraction 2026 Short 3M CBSE
A mirror used for rear-view of an automobile has a focal length 2.0 m. If a car is located at 8.0 m from the mirror: (a) Find out the position of the image of this car as seen in the mirror. (b) Draw the ray-diagram f...
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#16 Class 10 Science Electricity 2026 Short 2M CBSE
(a) State the law which gives the relation between the electric current flowing through a given conductor and the potential difference applied across it. (b) Draw V-I graph for a given conductor as per the law stated ...
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#17 Class 10 Science Electricity 2026 Short 5M CBSE
(i) Define the SI unit of power. Express the electric power of an electric appliance in terms of potential difference and current flowing through it. (ii) In a house, 3 bulbs of 100 W each, are lit for 5 hours daily a...
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#18 Class 10 Science Electricity 2026 Short 5M CBSE
(i) [Figure: A straight line graph of potential difference V (in volts: 0.4, 0.8, 1.2, 1.6, 2.0, 2.2) plotted against electric current I (in amperes: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) for a nichrome wire, passing through ...
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#19 Class 10 Science 2026 Short 3M CBSE
A person is suffering from a defect of vision due to the elongation of his/her eye ball. (a) Write the name of the defect of vision and write the other possible cause of this defect of vision. (b) This defect can be c...
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#20 Class 10 Science Electricity 2026 Short 2M CBSE
What do the symbols given below represent in an electric circuit? Write one function of each. (i) [Symbol: a circle marked V with + and - terminals connected in a line] (ii) [Symbol: a zig-zag resistor with an arrow d...
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