List of top Science Questions asked in UP Board

Atmospheric ozone layer protects the Earth from:

Which of the following compounds is used to complete the following chemical equation?
\[ CH_3COONa + \_\_\_\_\_\_ \xrightarrow{CaO} CH_4 + Na_2CO_3 \]

Function of phloem in plants is:

In humans, digestion starts with which organ?

Which of the following is a plant hormone?

Growth hormone is secreted by the:

Which of the following compound is formed by combining \(CO_2\) and \(H_2O\) in the presence of sunlight and chlorophyll?

Solution having zero pH is:

Which of the following metal forms hydrogen gas with cold water?

In a magnetic field, the direction of the force acting on a current-carrying conductor perpendicular to the field is:

Homologous series in the following are : (i) $C_2H_4$ and $C_3H_6$
(ii) $CH_3OH$ and $CH_3CHO$
(iii) $HCHO$ and $CH_3CHO$
The correct option in context of the above is :

If three resistors of different values of resistance are connected in a series combination, then all of them will definitely have the same value of:

In an electrical circuit, the unit of potential difference between the ends of a resistance is:

General formula of alkanes is:

The speed of light is maximum in:

Write the name and functions of any two plant hormones.

Mention the importance of stomata in plants.

Which mirror should be used to form an apparent and enlarged image of an object?

Which lens should be used to form an apparent and enlarged image of an object?

The reason for the blue colour of the sky is:

Explain the importance of experiments of Mendel in the rule for the inheritance of traits.

Why is the ozone layer important for us?

Write a short note on any two permanent methods of family planning.

What is the role of saliva in the digestion of food?

What is soap? Write the chemical reaction for the preparation of soap and write two characteristics of soap.