Class 10 Science Important Questions 2023

SECONDARY EXAMINATION, 2016

Part (A)
Q.1 Write the two components of baking powder.
Q.2 Write the name of reproductive process in the plants which have lost the capacity to produce seeds.
Q.3 Write the atomic weight of chlorine isotopes.
Q.4 In the following strong acid and strong alkaine base is-
(a) Acetic Acid or Hydrochloric Acid
(b) Sodium hydroxide or calcium hydroxide
Q.5 The magnetic field in a given region is uniform.

Q.6 Draw a diagram to represent it.
Q.7 Write the name of acidic oxides which are responsible for acid rain.
A current through a horizontal power line flows east to west direction. What is the direction of
magnetic field at a point directly below it?

In the given circuit diagram calculate the current I2 through the resistor of 10Ω.
Part (B)
What is combination reaction? Write combination reaction of quick lime with water.
Write four characterstics of the good source of energy.
In night which type of beam of light is used by drivers and why? Explain it.
Describe homologous organs with the help of example.
Why do we have two eyes for vision and not just one? Explain the fact on the basis of –
(a) Field of view
(b) Dimensional view
Write the definition of fossils and explain the process of dating of fossil.
Part (C)
(a) Write the chemical reaction of the photosynthesis and events occure during the process.
(b) Which type of mirror is used in head lights of vehicles?
(a) Which hormone is secreted by Adrinal glands? Write any one function of this hormone.
(b) Write any two function of betteries in vehicle.
What is redox reaction? In the reaction ZnO+C→Zn+CO which substance gets oxidised and which
gets reduced?
(a) Write down formula for the magnification obtained by a spherical mirror.
(b) Name a mirror that can give an erect and enlarged image of an object.
(c) Define the principle focus of a convex mirror.
Draw a labelled diagram of reflex arc and explain reflex action.
Match the column X to column Y
Column X (Physical Quantity/Law) Column Y (formula)
(i) Electric current (a) R = R1 + R2 + R3
(ii) Potential difference (b) ρ = RA / ℓ
(iii) Ohm’s Law (c)
(iv) Resistivity (b) V = W / Q
(v) Series combination of resistor’s (e) I = Q / t
(vi) Parallel combination of resistor’s (f) V = IR
If an egg is not fertilized then what happens? Explain it.
Write Newland’s Law of Octaves.
Write the name of element having similar properties of the following.
(a) Nitrogen
(b) Lithium
What is pH Scale? Explain that pH change of the mouth is cause of tooth decay.
An electric refrigerator rated 600 W operates 8 hour/day. What is the cost of the energy to operate it
for 30 days at Rs. 4.00 per KWh?

Part (D)
(a) What do you mean by food chain?
(b) Explain the food chain in grassland with an example.
(c) Explain the energy flow in an ecosystem with help of diagram.
(a) Which metal exists in liquid state at room temperature ?
(b) Write electronic configuration of nitrogen and chlorine atoms.
(c) Show the formation of sodium chloride by the transfer of electrons between nitrogen and
chlorine atoms.
Define alternating current and explain working of the device which produces it. Draw labelled
diagram. Describe the change in direction of current.
(a) Draw a labelled diagram of human respiratory system.
(b) Explain the transportation of oxygen and carbon dioxide in human beings.
Or
(a) What is respiration?
(b) Draw a labelled diagram of cross section of leaf.
(c) Explain the transportation of food and other substances in plants.
(a) Draw ray diagram of refraction of light through a prism and explain the phenomenon of
dispersion of light.
(b) Write the formula for lens power and define its unit.
Or
(a) Explain the following-
(i) Atmospheric refraction and advance sunrise.
(ii) Tyndall effect.
(iii) Draw the ray diagram of an eye suffering from short sightedness.
(a) Write molecular formula of benzene.
(b) Draw structure formula of benzene and write number of triple bonds present in it.
(c) Which is ethane in the following? Write number of co-operative bonds present in it.
(i) C2H2 (ii) C2H4 (iii) C2H6
(a) Write molecular formula of cyclohexane.
(b) Draw structure formula of cyclohexane and write number of co- operative bonds
present in it.
(c) Which is ethene in the following? Write number of double bonds present in it.
(i) C2H2 (ii) C2H4 (iii) C2H6

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