List of top Science Questions

The power of a lens is +2 dioptre. What will be its focal length in cm?
If the units of power, work, and time are represented by \( x_1, x_2, x_3 \) respectively, then which of the following relations is correct?
The solution with pH 8.5 is —
What is Ozone layer? Highlight its importance for Earth.
Due to which phenomenon of light does the sky appear blue?
In a spherical mirror the distance between its centre of curvature and pole is 20 cm. What is the distance of focus from the pole of the mirror?
From which lens the image of object formed is virtual, erect and smaller than the object?
Write an essay on human hormones.
Explain reactivity series and write its one use.
Write the chemical equation for the method of obtaining bleaching powder and its two uses.
What do you understand by acid and base? Write two applications of pH in daily life.
What is Fleming's Left Hand Rule?
On which factors does the magnetic field due to a current-carrying solenoid depend?
How many wires are used in domestic electrical circuits? Write the names of each and their colours of insulation.
On which factors does the force acting on a current-carrying conductor placed in a magnetic field depend?
Explain the process of combustion and write chemical equations of two examples of it.
Which character(s) of the Pea plant has been studied by Mendel in his experiments?
How are voltmeter and ammeter joined on passing current in a resistor?
A refrigerator of 500 watts is used for 12 hours every day. How much kilowatt-hour energy is consumed by the refrigerator for 30 days?
Which one of the following is an example of a producer in an ecosystem?
Draw a ray diagram of the image of an object formed by a concave lens.
State two natural phenomena of scattering of light.
Write down two uses each of convex mirror and convex lens.
How many types of defects of vision are there? Write down their names.
The autotrophic mode of nutrition requires: