List of top Science Questions

Solution having zero pH is:
Which of the following compounds is used to complete the following chemical equation?
\[ CH_3COONa + \_\_\_\_\_\_ \xrightarrow{CaO} CH_4 + Na_2CO_3 \]
Which of the following compound is formed by combining \(CO_2\) and \(H_2O\) in the presence of sunlight and chlorophyll?
In an electrical circuit, the unit of potential difference between the ends of a resistance is:
The speed of light is maximum in:
General formula of alkanes 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 :
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:
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:
Mention the importance of stomata in plants.
The reason for the blue colour of the sky is:
Write the name and functions of any two plant hormones.
Which lens should be used to form an apparent and enlarged image of an object?
Explain the importance of experiments of Mendel in the rule for the inheritance of traits.
Which mirror should be used to form an apparent and enlarged image of an object?
Write a short note on any two permanent methods of family planning.
Differentiate between minerals and ores.
What is soap? Write the chemical reaction for the preparation of soap and write two characteristics of soap.
Explain exothermic and endothermic reactions.
Why is the ozone layer important for us?
What is the role of saliva in the digestion of food?
What is pH value? How is it related to hydrogen ion concentration?
Write the IUPAC names of the following compounds:
The resistances 2Ω, 3Ω, and 5Ω are joined in series. If the two ends of the combination are joined to a potential difference of 30 volts, then find the potential difference between the ends of each resistance.