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Q1
mcq
1 mark
The correct statement among the following related to the concave lens is
-
A.
converges the light rays
-
B.
diverges the light rays
-
C.
forms inverted image
-
D.
forms real image.
Correct Answer: B —
Solution
A concave lens is a diverging lens, meaning it causes parallel rays of light passing through it to spread out (diverge). Option A is incorrect because converging is the property of a convex lens. Options C and D are generally incorrect because a concave lens always forms virtual, erect, and diminished images for all positions of the object.
Q2
mcq
1 mark
The SI unit of resistivity is
-
A.
ohm
-
B.
volt
-
C.
watt
-
D.
ohm-metre.
Solution not generated yet — check back soon.
Q3
short answer
1 mark
Calculate the power of convex lens with a focal length of $+ 0\cdot5$ m.
Solution
The power ($P$) of a lens is given by the formula $P = \frac{1}{f}$, where $f$ is the focal length in meters. Given $f = +0.5\text{ m}$, the power is $P = \frac{1}{0.5} = +2.0\text{ D}$.
Q4
short answer
1 mark
What are the reasons for occurring overload in an electric circuit ?
Solution
Overloading occurs in an electric circuit due to two main reasons: 1) Accidental connection of live wire and neutral wire (short-circuiting), which leads to a massive flow of current due to very low resistance. 2) Connecting too many electrical appliances to a single socket, which exceeds the current-carrying capacity of the circuit wiring.
Q5
short answer
1 mark
What is a solar cell ?
Solution
A solar cell is a device that converts solar energy (light energy) directly into electrical energy. It is typically made from semiconductor materials like silicon.
Q6
short answer
2 marks
An electric bulb with a resistance of $50\ \Omega$ is connected to 10 V battery in an electric circuit. Calculate the electric current flowing through the electric bulb and electric power of the bulb.
Q7
short answer
2 marks
Draw the diagram of a simple electric motor and label ‘Split rings’ ?
Q8
short answer
2 marks
Write any two limitations of producing electricity from wind energy.
Q9
short answer
3 marks
a) State the two laws of refraction of light.
b) "The refractive index of diamond is $2\cdot42$." Write the meaning of this statement.
Q10
long answer
3 marks
Draw the ray diagram of image formation when the object is kept at $2F_1$ of the convex lens. With the help of the ray diagram, mention the position and nature of the image formed. [$F_1$ : Principal focus of the lens]
OR
Draw the ray diagram of image formation when the object is kept between C and F of the concave mirror. With the help of the ray diagram mention the position and the nature of the image formed. [$F$ : Principal focus of the mirror, C : Centre of curvature of mirror]
Q11
long answer
3 marks
List the properties of the magnetic field due to the flow of electric current in a solenoid. What are the two methods of increasing magnetic field in a solenoid ?
Q12
long answer
4 marks
a) Write any four uses of concave mirror.
b) An object is placed at a distance of 15 cm on the principal axis in front of a concave lens with a focal length of 10 cm. Find the image distance.
Q13
long answer
4 marks
a) State Joule’s law of heating. Name any two devices that work on the application of this law.
b) Why are the alloys like nichrome used in electrical heating devices ?
OR
a) State Ohm’s law. In domestic electric circuit electrical appliances are not connected in series. Why ?
b) Write the factors on which resistance of a conductor depends.
Q14
mcq
1 mark
The metal that displaces copper from copper sulphate solution is
-
A.
mercury
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B.
gold
-
C.
iron
-
D.
silver
Q15
mcq
1 mark
Number of single bonds found in the molecular structure of propanal is
Q16
short answer
1 mark
State the modern periodic law.
Q17
short answer
2 marks
Draw the diagram of the arrangement of apparatus used to show the electrolysis of water and label ‘graphite rod’.
Q18
long answer
2 marks
The chemical reaction that takes place between sodium sulphate and barium chloride is called double displacement reaction. Why ? Write the balanced chemical equation for this reaction.
OR
What is the type of chemical reaction in which quicklime is obtained by lime stone (calcium carbonate) ? Write a chemical equation for this reaction.
Q26
mcq
Primary consumers in any food chain are always
-
A.
carnivores
-
B.
herbivores
-
C.
higher carnivores
-
D.
producers.
Q27
mcq
Part of a flower in the plant that develops into fruit is
-
A.
petal
-
B.
stigma
-
C.
ovary
-
D.
style.
Q28
short answer
1 mark
Which hormone inhibits the growth of plants ?
Q29
short answer
1 mark
What is the sex of a child born by receiving X chromosome from father ?
Q30
short answer
1 mark
Nowadays Chlorofluorocarbon ( CFC ) free refrigerators are being manufactured. Why ?
Q31
short answer
1 mark
What is ‘biological magnification’ ?
Q32
short answer
2 marks
Mention any two effects of non-biodegradable substances on the environment.
Q32
short answer
2 marks
Mention any two methods that reduce the problems caused while disposing the wastes.
Q33
short answer
2 marks
Can the wing of butterfly and the wing of bat be considered as Analogous organs ? If yes, why ? If no, why ?
Q34
short answer
2 marks
Draw the diagram showing the structure of human excretory system and label ‘ureter’.
Q35
long answer
3 marks
Explain the stages of ‘double circulation’ of the blood in humans.
Q35
long answer
3 marks
Mention the events that occur during photosynthesis in plants. What are the methods used by plants to get rid of excretory products ?
Q36
long answer
3 marks
How does uterus prepare to receive the fertilized egg in woman ? What happens if egg does not fertilise ? Explain.
Q37
long answer
3 marks
“An individual organism cannot pass the experiences acquired during its life time to the progenies of the next generation.” Explain this concept with the help of an illustration.
Q37
long answer
3 marks
Pure ‘short’ pea plant is crossed with pure ‘tall’ pea plant. Represent the results obtained in $F_2$ generation of monohybrid cross with the help of checker board and mention the ratio of the types of plants obtained.
Q38
long answer
4 marks
Draw the diagram showing the structure of the human brain and label the following parts : i) Cerebellum ii) Mid-brain.
