List of top Science Questions

The speed of light is maximum in:
Write the name and functions of any two plant hormones.
Explain the importance of experiments of Mendel in the rule for the inheritance of traits.
Which lens should be used to form an apparent and enlarged image of an object?
Mention the importance of stomata in plants.
Which mirror should be used to form an apparent and enlarged image of an object?
The reason for the blue colour of the sky is:
Write a short note on any two permanent methods of family planning.
Write the IUPAC names of the following compounds:
Why is the ozone layer important for us?
What is the role of saliva in the digestion of food?
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.
What is pH value? How is it related to hydrogen ion concentration?
Explain
(i) Fleming’s Left Hand Rule and
(ii) Right Hand Thumb Rule. For which physical quantities are they used for finding their directions?
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:
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.
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.
Which of the following is/are called environment-friendly practice(s)?
Loop is placed in which part of the female reproductive system?
Which of the following organ represents the male reproductive organ in plants?
Mendel got his primary education in: