Many of the ancient system of measurement were based on the dimensions of___________.

A car is being driven at a speed of 20 ms^-1 when brakes are applied to bring it to rest in 5 s. The decelaration produced in this case will be

The point at which the rays are converged or diverged by a mirror is _____________________

The correct electronic configuration of potassium is

Which vitamin causes bow legs?

Data processing involves________ steps

If in the circuit, power dissipation is 150 W, then R - is___________

Elements in the modern periodic table are arranged in__________ groups and __________ periods.

To prevent the entry of food into the trachea, the opening is guarded by__________

A Sonar device on a submarine send out a signal and receives an echo 5 seconds later. Calculate the speed of sound it water if the distance of the object from the submarine is 3500 m.

Which one of the following is an Italian species of honey bee?

Find out the part that is not found in CPU?

What is the full form of SI system?

What happens when a ray of light travels from rarer medium to the denser medium?

Is air a pure substance or Mixture? Justify.

For an atom ‘X’, K, L and M shells are completely filled. How many electrons will be present in it?

Which fluid fills in the body cavity?

The doctor advices an adolescent girl who is suffering from anaemia to include more of leafy vegetables and dates in her diet. Why so?

Write a note on ENIAC.

Differentiate Collenchyma and Sclerenchyma

What is the measuring unit of the thickness of a plastic carry bag?

The diagram shows the position of a ball it rolls down a track - the ball took 0.5s sec to roll from one position to other.
(a) State where the motion of the ball is uniform or non-uniform motion.
(b) What is the distance travelled by the ball in 2.5 s?
(c) Find the average velocity of the ball from. A to F.

State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give reason for your answer.

Define quantum numbers

There are 3 plants A, B and C. The flowers of A open their petals in bright light during the day but closes them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but closes them during the day when there is bright light. The leaves of plant C fold up and droop when touched when fingers or any other solid object.
(a) Name the phenomenon shown by the flowers of plant A and B.
(b) Name one plant each which behaves like the flowers of plant A and B.
(c) Name the phenomenon exhibited by the leaves of plant C.
(d) Name a plant which behave like those of plant C.

Comment on the aquatic and terrestrial habits of amphibians.

A metal ball of heat capacity 50J/⁰C loses 2000 J of heat. By how much will its temperature fall?

State Ohm’s law.

Draw magnetic field lines around a bar magnet

What do you mean by Operating System? How it Works?