List of top Science Questions

At the time of short circuit, the electric current in the circuit becomes
The magnitude of magnetic force acting on a current carrying conductor in a uniform magnetic field does not depend on
If the electric current passing through a fixed resistor is halved, then the heat produced in it will become
The image formed by a mirror is virtual, erect and longer than the object, then the mirror will be
The blue colour of the sky is due to the
The refractive index of glass is 1.5. The speed of light in air is \(3 \times 10^8\) m/s. The speed of light in glass will be
The unit of power of a lens is
Write a note on the following:
(i) Gregor Johann Mendel
(ii) Reflex arc
(ii) Write chemical reaction for manufacture of bleaching powder and its two applications.
Describe the digestive system of human with diagram.
Write a note on the following:
(i) Spore formation in Rhizopus
(ii) Seed germination
Describe co-ordination in plants with examples.
Write a short note on the following:
(i) Importance of pH in daily life
(ii) Micelle
(iii) Metals and Non-metals
(i) What are Exothermic and Endothermic reactions? Explain with example.
What are the trophic levels? Give an example of a food chain and state the different trophic levels in it.
(ii) What do you understand by Electrolytic refining? Explain with diagram.
(iii) A refrigerator of 200 W is operated for 10 hours per day. Find out the cost of energy to operate it for 30 days at the rate of ₹6 per kWh.
(i) Explain Corrosion. Write its two examples.
(ii) Why fuse is used in domestic electrical circuits?
i) Write balanced equations for the following reactions:
(a) Aluminum + Copper chloride → Aluminum chloride + Copper:
(b) Magnesium + Hydrochloric acid → Magnesium chloride + Hydrogen:
ii) Write IUPAC names for the following compounds:
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(iii) State the law to find the direction of magnetic field produced due to straight current carrying wire.
(i) Draw magnetic lines of force due to a current carrying solenoid.
(ii) What do you understand by the heating effect of electric current? In a heater of resistance \(10 \, \Omega\), a current of \(15 \, \text{A}\) is flowing for 30 minutes. What will be the amount of heat produced in the heater?
(ii) What is the meaning of magnification produced by a lens? An object of length 5 cm is at a distance of 15 cm from a convex lens. Focal length of the lens is 10 cm. What will be the size of the image?