List of top Questions asked in UP Board X

(ii) An object at a distance of 16 cm from a spherical mirror forms a virtual image at a distance of 12 cm behind the mirror. Determine the magnification of the image and type of the mirror.
(i) Draw a labelled ray diagram to show the formation of a virtual magnified image of an object by a convex 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.
Molecular formula of butanol-2 is
What are required for photosynthesis?
What is required for the synthesis of thyroxine hormone ?
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 ?
'Guard Cells' are found in
The magnitude of magnetic force acting on a current carrying conductor in a uniform magnetic field does not depend on
At the time of short circuit, the electric current in the circuit becomes
Strong base is
O_2(g) is obtained on heating
Liquid metal at ordinary temperature is
Precipitation reaction is
The image formed by a mirror is virtual, erect and longer than the object, then the mirror will be
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 blue colour of the sky is due to the
If the electric current passing through a fixed resistor is halved, then the heat produced in it will become
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.
(i) What are Exothermic and Endothermic reactions? Explain with example.
Write a short note on the following:
(i) Importance of pH in daily life
(ii) Micelle
(iii) Metals and Non-metals
What are the trophic levels? Give an example of a food chain and state the different trophic levels in it.