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#1 Class Class 10 Chemistry Carbon and its Compounds 2026 Mcq 1M

Which of the following compounds will undergo addition reaction ?

A. $C_4H_{10}$

B. $C_4H_8$

C. $C_3H_8$

D. $CH_4$

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#2 Class Class 10 Chemistry Carbon and its Compounds 2026 Mcq 1M

Which of the following compounds does *not* undergo addition reaction ?

A. $C_4H_8$

B. $C_2H_2$

C. $C_5H_{10}$

D. $C_3H_8$

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

To a small amount of copper oxide in a beaker, when we add dilute hydrochloric acid slowly with stirring, the change in the colour of the solution is due to the formation of :

A. Copper(II) oxide, which is black in colour.

B. Copper(I) chloride, which is blue in colour.

C. Copper(II) chloride, which is blue-green in colour.

D. Copper(I) oxide, which is black in colour.

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#4 Class Class 10 Chemistry Chemical Reactions and Equations 2026 Mcq 1M

Which of the following is an example of a displacement reaction ?

A. The combustion of natural gas

B. The reaction of a reactive metal with dilute acid

C. The electrolysis of water

D. The reaction of quick lime with water

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

In the following equation
$$x\,KI + H_2O_2 \rightarrow I_2 + y\,KOH$$
x and y respectively are :

A. 2, 2

B. 1, 2

C. 2, 1

D. 1, 1

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#6 Class Class 10 Physics Magnetic Effects of Electric Current 2026 Long 5M

Attempt either (a) or (b) :

(a) (i) Write the name and statement of the rule used to determine the direction of the :
(I) force experienced by a straight current-carrying conductor placed in a uniform magnetic field perpendicular to the field.
(II) magnetic field produced around a straight conductor carrying electric current.
(ii) Differentiate between the magnetic field due to a bar magnet and the magnetic field due to a current-carrying solenoid.

OR

(b) (i) With the help of a diagram, describe an activity in brief to show that a current-carrying straight conductor produces a magnetic field around it.
(ii) [Figure: Conductor (A) carries a current $I = 1$ A with a field line of radius 2 cm through point P. Conductor (B) carries a current $I = 2$ A, with field lines of radius 2 cm through Q and 4 cm through R.]
(I) Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B).
(II) Compare the strengths of magnetic fields produced (1) at points P and Q and (2) at points Q and R due to these current-carrying conductors, qualitatively.

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#7 Class Class 10 Physics Magnetic Effects of Electric Current 2026 Long 5M

Attempt either (a) or (b) :

(a) (i) What is a solenoid ? Draw a diagram showing the magnetic field pattern due to a current-carrying solenoid (inside and outside).
(ii) Name any two factors on which the magnitude of the magnetic field due to a current-carrying solenoid depends.
(iii) A current-carrying solenoid is stretched and converted into a straight wire carrying current. Draw a diagram showing the magnetic field pattern around it and mark the direction of the magnetic field.

OR

(b) (i) With the help of a diagram, show that a current-carrying conductor placed in an external magnetic field, experiences a force. Indicate the direction of the field, current and force clearly.
(ii) [Figure: An electron moving vertically upwards in a uniform magnetic field whose field lines are directed horizontally towards the left.]
(I) What will be the direction of the force acting on the electron ?
(II) What will happen to the direction of the force acting on the electron, if the direction of the magnetic field as well as the direction of motion of the electron, both are reversed ?

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#8 Class Class 10 Physics Magnetic Effects of Electric Current 2026 Long 5M

Attempt either (a) or (b) :

(a) A person was repairing an electric heater. He observed that there were three different connecting wires of three different colours in the cable attached to the heater.
(i) What are these three different wires called ? Name them colourwise.
(ii) What is the value of standard potential difference at which electricity is supplied in Indian homes for lighting ?
(iii) What is the role of (I) earthing and (II) fuse in domestic electric circuits ?

OR

(b) (i) Write the name and statement of the rule used to determine the direction of the :
(I) force experienced by a straight current-carrying conductor placed in a uniform magnetic field perpendicular to the field.
(II) magnetic field produced around a straight conductor carrying electric current.
(ii) [Figure: Conductor (A) carries a current $I = 1$ A and a field line of radius 2 cm passes through point P. Conductor (B) carries a current $I = 2$ A; a field line of radius 2 cm passes through point Q and another of radius 4 cm passes through point R. The current in (A) is directed upwards and in (B) downwards.]
(I) Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B).
(II) Compare the strengths of magnetic fields produced (1) at points P and Q and (2) at points Q and R due to these current-carrying conductors, qualitatively.

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#9 Class Class 10 Physics Light - Reflection and Refraction 2026 Long 4M

The variation of image distance ($v$) with the object distance ($u$) for a convex lens is given in the following observation table. Analyse it and answer the questions given below :

| S.No. | Object distance ($u$) cm | Image distance ($v$) cm |
|---|---|---|
| 1 | -150 | +30 |
| 2 | -75 | +37.5 |
| 3 | -50 | +50 |
| 4 | -37.5 | +75 |
| 5 | -30 | +150 |
| 6 | -15 | +37.5 |

(a) Without calculation, find out the focal length of the given convex lens. Justify your answer.
(b) Which one of the observations given in the table is not correct and why ?
(c) (i) Find out the value of magnification for $u = -30$ cm. Write the nature of the image formed. Give reason for your answer.
OR
(c) (ii) Analyse the data given in the table above and draw the labelled ray diagram for $u = -30$ cm and $v = 150$ cm.

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#10 Class Class 10 Physics Electricity 2026 Short 3M

(a) Name a device which is used to :
(i) Maintain a constant potential difference in a circuit.
(ii) Change the electric current in an electric circuit.
(b) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What will be the value of current flowing through it when the potential difference is increased to 220 V ?

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#11 Class Class 10 Physics Electricity 2026 Short 3M

(a) State Ohm's law and justify that V - I graph for Ohm's law will always be a straight line passing through the origin.
(b) [Figure: V-I graphs for two wires A and B; both are straight lines through the origin, the line for B being steeper than the line for A.] The figure shows V - I graphs for two identical wires A and B having the same length and area of cross-section, but made of different materials. Which of these wires will be more suitable for making the heating element of an electric heater and why ?

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#12 Class Class 10 Physics The Human Eye and the Colourful World 2026 Short 3M

[Figure: An eye receiving parallel rays from a nearby object at O; the near point of the defective eye has shifted from O to a farther point O' (shown by dotted lines). The rays converge at a point behind the retina.]

Study the given diagram and answer the questions that follow :
(a) Write the name of the eye defect shown in the diagram. Where is the image formed in this eye defect with respect to the retina of the eye ?
(b) List two causes of this eye defect.
(c) With the help of a ray diagram, show how this defect of vision is corrected.

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#13 Class Class 10 Physics The Human Eye and the Colourful World 2026 Short 3M

[Figure: An eye with rays coming from a point N' (the far point) being converged by the eye lens to a point IN FRONT OF the retina; N is a farther point which the eye cannot see clearly.]

Study the given diagram and answer the questions that follow :
(a) Write the name of the eye defect shown in the diagram. Where is the image formed in this eye defect with respect to the retina of the eye ?
(b) List two causes of this eye defect.
(c) With the help of a diagram, show how this eye defect of vision is corrected.

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#14 Class Class 10 Physics Electricity 2026 Short 3M

[Figure: A circuit with a 10 V battery. Between points R and S, a $4\,\Omega$ and a $1\,\Omega$ resistor are joined in series, and this combination is connected in parallel with a $5\,\Omega$ resistor. Between points P and Q, a $2\,\Omega$ and a $3\,\Omega$ resistor are joined in series, and this combination is connected in parallel with another $5\,\Omega$ resistor. An ammeter A is included in the circuit.]

Consider the given electric circuit. Calculate the following :
(a) Total resistance of the circuit
(b) The electric current drawn from the battery
(c) Potential difference between points P and Q

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#15 Class Class 10 Physics Light - Reflection and Refraction 2026 Short 2M

Redraw the following ray diagrams in your answer book and show the path of reflected/refracted ray :
(i) [Figure: A concave mirror with pole P, focus F and centre of curvature C. A ray of light parallel to the principal axis is incident on the mirror.]
(ii) [Figure: A concave lens with optical centre O, focus $F_1$ and $2F_1$. A ray of light parallel to the principal axis is incident on the lens.]

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#16 Class Class 10 Physics The Human Eye and the Colourful World 2026 Short 2M

Attempt either (a) or (b) :

(a) What happens when light is scattered from (i) very fine particles and (ii) very large size particles of medium ? Justify your answer in each case.

OR

(b) With the help of a ray diagram, explain any phenomenon of formation of spectrum in nature.

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#17 Class Class 10 Physics Light - Reflection and Refraction 2026 Short 2M

[Figure: A ray of light travelling in medium A strikes the boundary between the two media and passes into medium B. NN' is the normal drawn at the point of incidence; the ray in medium B makes a larger angle with the normal than the ray in medium A.]

A ray of light enters into medium B from medium A as shown in the given figure :
(a) Which one of these two media is optically denser than the other medium ? Justify your answer.
(b) If the speed of light in medium A is $V_A$ and in medium B is $V_B$, then what is the refractive index of medium B with respect to medium A ?

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#18 Class Class 10 Physics Light - Reflection and Refraction 2026 Short 2M

Draw the ray diagram showing refraction through a glass slab and write the relation between angle of incidence, angle of refraction and refractive index of glass.

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#19 Class Class 10 Physics Magnetic Effects of Electric Current 2026 Long 1M

Assertion (A) : The needle of a compass, kept in an external magnetic field, always aligns itself in the North-South direction of the Earth.
Reason (R) : The behaviour of the needle of the compass is similar to the behaviour of a freely suspended bar magnet.

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#20 Class Class 10 Physics Electricity 2026 Mcq 1M

In an electric circuit carrying current $I$, a $2\,\Omega$ resistor is replaced by an $8\,\Omega$ resistor without changing the connected (ideal) battery. Then :

A. current becomes $\frac{I}{4}$ and potential difference $\frac{V}{4}$

B. current becomes $\frac{I}{4}$ and potential difference remains $V$

C. current becomes $4I$ and potential difference remains $V$

D. current becomes $4I$ and potential difference $\frac{V}{4}$

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