List of top Science Questions

Differentiate between minerals and ores.
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?
Write the IUPAC names of the following compounds:
What is soap? Write the chemical reaction for the preparation of soap and write two characteristics of soap.
Explain exothermic and endothermic reactions.
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.
Write down the working and colours of the insulation of the wires used in the domestic electrical distribution circuit:
(i) Live wire
(ii) Earthing wire
(iii) Neutral wire
Write the balanced chemical equations for the following reactions:
Explain
(i) Fleming’s Left Hand Rule and
(ii) Right Hand Thumb Rule. For which physical quantities are they used for finding their directions?
Which of the following organ represents the male reproductive organ in plants?
Loop is placed in which part of the female reproductive system?
The focal length of a convex lens is 50 cm. State the position of the image of an object placed at a distance of 25 cm, perpendicularly on its axis. Also, determine the magnification of the image.
At what distance should an object be placed from a concave mirror of focal length 10 cm, so that a real image 5 times larger is formed? Also, find the position of the image.
Which of the following is/are called environment-friendly practice(s)?
Reproduction in Hydra occurs by:
The process of breakdown of pyruvate takes place in:
The kidneys in human beings are a part of which system?
Chemical formula of propane is:
Mendel got his primary education in:
Which of the following is an amphoteric oxide?
Matte mainly consists of:
Which of the following is an acidic salt?
Complete the following chemical equation:
________ + PCl5 → CH3COCl + POCl3 + HCl