List of top Science Questions

The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.
Prepare a list of objects around you that are electroplated.
What is the importance of universal law of gravitation?
What are the differences between the transport of materials in xylem and phloem?
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
An object of mass \(40\) \(kg\) is raised to a height of \(5\) \(m\) above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –
Differentiate between metal and non-metal on the basis of their chemical properties.
Describe characteristics and uses of coke.
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

Butanone is a four-carbon compound with the functional group

At the time of short circuit, the current in the circuit
Which of the following correctly describes the magnetic field near a long straight wire?
Draw a labelled diagram of the longitudinal section of a flower.
What are the major groups of microorganisms?

Describe double circulation of blood in human beings.Why is it necessary?

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
Convert the following temperatures to the Celsius scale.
(a) 293 K
(b) 470 K
A spherical mirror and a thin spherical lens have each a focal length of −15 cm. The mirror and the lens are likely to be
What are weeds? How can we control them?
Compare the power used in the 2 Ω resistor in each of the following circuits:
  1. a 6 V battery in series with 1 Ω and 2 Ω resistors,
  2. a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.