1. A student heats ferrous sulphate crystals in a
dry boiling tube. The colour of the residue formed is:
- (a) Green
- (b) Brown
- (c) Blue
- (d) White
2. Which of the following statements about the
reaction below are incorrect?
\(2PbO(s) + C(s) \rightarrow 2Pb(s) + CO_2(g)\)
(i) Lead is getting
reduced.
(ii) Carbon dioxide is getting oxidised.
(iii) Carbon is getting oxidised.
(iv) Lead
oxide is getting reduced.
- (a) (i) and (ii)
- (b) (i) and (iii)
- (c) (i), (ii) and (iii)
- (d) All
3. The ability of carbon to form chains with other
carbon atoms is called:
- (a) Isomerism
- (b) Catenation
- (c) Tetravalency
- (d) Polymerisation
4. In which part of the alimentary canal is food
finally digested?
- (a) Stomach
- (b) Mouth cavity
- (c) Large intestine
- (d) Small intestine
5. The movement of a plant part in response to light
is called:
- (a) Geotropism
- (b) Hydrotropism
- (c) Chemotropism
- (d) Phototropism
6. A cross between a tall plant (TT) and short plant
(tt) resulted in progeny that were all tall plants because:
- (a) Tallness is the recessive trait.
- (b) Shortness is the dominant trait.
- (c) Height of pea plant is not governed by gene T or t.
- (d) Tallness is the dominant trait.
7. The image formed by a concave mirror is real,
inverted and of the same size as the object. The position of the object must be:
- (a) At the focus
- (b) Between the centre of curvature and focus
- (c) At the centre of curvature
- (d) Beyond the centre of curvature
8. The change in focal length of an eye lens is
caused by the action of the:
- (a) Pupil
- (b) Retina
- (c) Ciliary muscles
- (d) Iris
9. Two resistors of \(4 \Omega\) and \(2 \Omega\)
are connected in series. The current flowing through the \(4 \Omega\) resistor is 1 A. The current
flowing through the \(2 \Omega\) resistor will be:
- (a) 1 A
- (b) 2 A
- (c) 0.5 A
- (d) 4 A
10. The magnetic field lines outside a bar
magnet:
- (a) Originate from the South pole and end at its North pole.
- (b) Originate from the North pole and end at its East pole.
- (c) Originate from the North pole and end at its South pole.
- (d) Originate from the South pole and end at its West pole.
11. Which of the following is an example of an
endothermic reaction?
- (a) Burning of natural gas
- (b) Decomposition of calcium carbonate
- (c) Respiration
- (d) Reaction of zinc with dilute hydrochloric acid
12. Offspring formed by asexual reproduction exhibit
more similarity among themselves because:
- (i) Asexual reproduction involves only one parent.
(ii) Asexual reproduction involves
gametes.
(iii) Asexual reproduction occurs before sexual reproduction.
(iv) Asexual reproduction
does not involve gametes.
- (a) (i) and (ii)
- (b) (i) and (iii)
- (c) (ii) and (iv)
- (d) (i) and (iv)
13. Disposable plastic plates should not be used
because:
- (a) They are made of materials with light weight.
- (b) They are made of toxic materials.
- (c) They are made of biodegradable materials.
- (d) They are made of non-biodegradable materials.
14. When a beam of white light falls on a glass
prism, the colour of light which deviates the least is:
- (a) Violet
- (b) Red
- (c) Green
- (d) Blue
15. Calculate the equivalent resistance between
points A and B if three resistors of \(6 \Omega\) each are connected in parallel.
- (a) \(18 \Omega\)
- (b) \(6 \Omega\)
- (c) \(3 \Omega\)
- (d) \(2 \Omega\)
16. Which of the following statements regarding the
magnetic field produced by a current-carrying solenoid is incorrect?
- (a) The magnetic field inside the solenoid is uniform.
- (b) The magnetic field lines inside the solenoid are parallel.
- (c) The magnetic field increases if a soft iron core is inserted.
- (d) The magnetic field decreases if the current is increased.
Assertion-Reason Questions (17-20): Select
the correct option: (a) Both A and R are true and R is correct explanation of A. (b) Both A and R are true
but R is NOT correct explanation. (c) A is true, R is false. (d) A is false, R is true.
17. Assertion (A): Zinc oxide is an
amphoteric oxide.
Reason (R): Zinc oxide reacts with both acids and bases to produce
salt and water.
18. Assertion (A): Translocation of
food in plants takes place in sieve tubes with the help of companion cells.
Reason
(R): Translocation in phloem is achieved by utilizing energy from ATP.
19. Assertion (A): Myopia is the
defect of the eye in which a person can see near objects clearly but cannot see distant objects
distinctly.
Reason (R): This defect is corrected by using a convex lens.
20. Assertion (A): A geneticist
crossed a pea plant having violet flowers with a pea plant having white flowers, and he got all violet
flowers in the first generation.
Reason (R): White colour gene is not passed on to
the next generation.
21. Explain the function of: (a) Earth wire, (b)
Fuse wire in a domestic electric circuit.
22. Why does the sky appear dark instead of blue to
an astronaut?
23. State the role of the following in the human
digestive system: (a) Pepsin, (b) Villi.
24. Name the reproductive parts of an angiosperm.
Where are these parts located?
25. (a) Why is respiration considered an exothermic
reaction?
(b) Write the chemical equation for the respiration process.
26. Translate the following statements into chemical
equations and balance them:
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Potassium
metal reacts with water to give potassium hydroxide and hydrogen gas.
27. Explain the formation of Sodium Chloride
(\(NaCl\)) and Magnesium Chloride (\(MgCl_2\)) with the help of electron dot structures. (Atomic No:
Na=11, Mg=12, Cl=17).
28. (a) Define the term 'functional group'. Identify
the functional group present in (i) Butanone, (ii) Butanoic acid.
(b) Draw the structure of
Hexanal.
29. (a) Draw a schematic representation of the
transport and exchange of oxygen and carbon dioxide during the cardiac cycle (Double
circulation).
(b) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and
birds?
30. (a) Trace the sequence of events which occur
when a bright light is focused on your eyes.
(b) Name the receptor and the effector in this
pathway.
31. A convex lens forms a real and inverted image of
a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the
image is equal to the size of the object? Also, find the power of the lens.
32. (a) State Joule's Law of heating.
(b) An
electric heater of resistance \(8 \Omega\) draws 15 A from the service mains 2 hours. Calculate the rate
at which heat is developed in the heater.
33. (a) List the factors on which the resistance of
a conductor depends.
(b) Why are alloys commonly used in electrical heating devices?
34. (a) Differentiate between Roasting and
Calcination with examples.
(b) How is copper extracted from its sulphide ore? Write the balanced
chemical equations involved.
(c) Draw a labeled diagram of Electrolytic Refining of Copper.
OR
(a) What is a homologous series? Write the general formula of Alkanes, Alkenes,
and Alkynes.
(b) Write the IUPAC names of: (i) \(CH_3-CH_2-Br\), (ii) \(H-CHO\).
(c) Explain the
mechanism of the cleaning action of soap.
35. (a) Draw a well-labeled diagram of the human
female reproductive system.
(b) Explain the role of (i) Ovary, (ii) Oviduct, (iii) Uterus.
(c)
What is the placenta? Mention its function.
OR
(a) What is Genetics? Define the terms: (i) Genotype, (ii) Phenotype.
(b) In
humans, if a sperm carrying 'Y' chromosome fertilizes the egg, what will be the sex of the child?
Explain with a flow chart.
(c) Why are acquired traits not inherited?
36. (a) Draw a ray diagram to show the formation of
an image by a concave mirror when the object is placed: (i) Between pole and focus, (ii) At the centre
of curvature.
(b) Use the mirror formula to prove that for a concave mirror, the image formed is real
and inverted when the object is placed beyond the focus (take \(u > f\)).
OR
(a) What is refraction of light? State the laws of refraction.
(b) A ray of
light enters from air into a rectangular glass slab. Draw a diagram to show the path of the ray. Mark
the angle of incidence, angle of refraction, and angle of emergence.
(c) If the refractive index of
diamond is 2.42, what is the meaning of this statement in relation to the speed of light?
37. Case Study - Chemistry:
The pH of a solution is a critical parameter in various biological and industrial processes. The
strength of acids and bases depends on the number of \(H^+\) ions and \(OH^-\) ions produced,
respectively. Salts of a strong acid and a strong base are neutral with pH 7. Salts of a strong acid and
weak base are acidic, while salts of a strong base and weak acid are basic.
(i) What is the pH range of our body? (1 Mark)
(ii) Rain water is called 'Acid Rain' when its pH falls below what value? (1 Mark)
(iii) (a) A solution turns pink when phenolphthalein is added. What is the likely pH of this solution?
Name one such substance. (2 Marks)
OR
(iii) (b) Why does a baker add baking powder (mixture of baking soda and tartaric acid) to the cake
batter instead of just baking soda? (2 Marks)
38. Case Study - Biology:
Kidneys are the vital organs for excretion in humans. The structural and functional unit of the kidney
is the Nephron. Each kidney has large numbers of these filtration units packed close together. Some
substances in the initial filtrate, such as glucose, amino acids, salts and a major amount of water, are
selectively reabsorbed as the urine flows along the tube.
(i) Name the cup-shaped structure at the upper end of the nephron. (1 Mark)
(ii) What is the main nitrogenous waste removed by kidneys? (1 Mark)
(iii) (a) Explain the function of the Glomerulus. (2 Marks)
OR
(iii) (b) Patients with kidney failure are put on 'Artificial Kidney'. What is this process called?
Briefly explain the principle. (2 Marks)
39. Case Study - Physics:
A solenoid is a long coil of circular loops of insulated copper wire. Magnetic field lines are produced
around the solenoid when a current is passed through it. The magnetic field produced is similar to that
of a bar magnet. The strength of the magnetic field depends upon the number of turns and the magnitude
of current.
(i) What is the pattern of magnetic field lines inside the solenoid? (1 Mark)
(ii) State the rule used to find the direction of the magnetic field. (1 Mark)
(iii) (a) A soft iron bar is inserted inside a current-carrying solenoid. What happens to the magnetic
field? What is this device called? (2 Marks)
OR
(iii) (b) Compare the magnetic field of a solenoid with that of a bar magnet. Give two differences. (2
Marks)