List of top Science Questions asked in UP Board X

Explain corrosion by giving example.

Write the chemical equations for two chemical properties of ethanol.

Write the chemical equation for obtaining gypsum from plaster of Paris.

Explain the following:
(a) Double decomposition reaction
(b) Neutralization reaction

Write the chemical equations for two chemical properties of acetic acid.

Three wires A, B and C are emerging out from the main source of a house. What will be the name, function, and colour of the insulation for each wire?

Write the use of bleaching powder in purification of water.

Natural ecosystem is —

The resistance of a conductor depends on which factors and how? The resistance of a wire is \( R \). What will be the resistance of the wire when the wire is of double length and half the radius of the same material?

Example of regeneration is —

Producer in a food chain is —

The speeds of light in water and glass are respectively \( 2.25 \times 10^8 \, \text{m/s} \) and \( 2.0 \times 10^8 \, \text{m/s} \). Calculate the following refractive indices:
(i) The glass relative to water.
(ii) The glass relative to air.

Depletion of ozone layer is caused by which of the following?

What are the defects of vision? Write down the names of the lenses used for the correction of vision defect of three persons P, Q, and R if —
(i) \( P \) can see only near objects clearly but cannot see far objects.
(ii) \( Q \) can see only far objects clearly but cannot see near objects.
(iii) \( R \) can neither see far objects nor near objects clearly.

Blood pressure is measured by —

Which of the following is a plant hormone?

Unisexual flower is —

Chemical formula of calcium nitrate is —

The element having 7 electrons in its outermost orbit is —

An unsaturated hydrocarbon in the following is —

The power of a lens is +2 dioptre. What will be its focal length in cm?

The formula of plaster of Paris is —

IUPAC name of CH{3–CH(CH3)–CHO is —}

If the units of power, work, and time are represented by \( x_1, x_2, x_3 \) respectively, then which of the following relations is correct?

In a conductor, 10 ampere of current is flowing. What will be the amount of charge flowing in 2 seconds corresponding to it?