List of top Questions asked in UP Board X

(i) Explain with the help of labelled ray diagram, the defect of hypermetropia. How is it corrected by a lens?
(ii) A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.
Which of the following is correctly matched?
'Guard Cells' are found in
What is required for the synthesis of thyroxine hormone ?
Molecular formula of butanol-2 is
What are required for photosynthesis?
Mendel crossed long and dwarf plants of pea. The percentage of long and dwarf plants in first filial generation (F\(_1\)) was
Which of the following is a biotic component of Ecosystem ?
Liquid metal at ordinary temperature is
Strong base is
O_2(g) is obtained on heating
Precipitation reaction is
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
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 image formed by a mirror is virtual, erect and longer than the object, then the mirror will be
If the electric current passing through a fixed resistor is halved, then the heat produced in it will become
The blue colour of the sky is due to the
The unit of power of a lens is
Write a note on the following:
(i) Gregor Johann Mendel
(ii) Reflex arc
Write a note on the following:
(i) Spore formation in Rhizopus
(ii) Seed germination
Describe co-ordination in plants with examples.
(ii) Write chemical reaction for manufacture of bleaching powder and its two applications.
(i) What are Exothermic and Endothermic reactions? Explain with example.