A ___________ is a glass enclosure that helps plants to grow in cold climates.

• Atmosphere

• Greenhouse

• None of these

On which part of the eye the images of an object are formed ?

• Pupil

• Iris

• Cornea

• Optic nerve

• Retina

There are __________ number of bones in a new born baby.

• 300

• 206

• 800

• 106

How many pairs of nerves are there in our body ?

• 32

• 33

• 23

• 43

In a _________ class lever the load is in the centre.

• 3rd class

• 2nd class

• 1st class

• None of these

In which layer of the atmosphere do space shuttles and air crafts orbit ?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

• Exosphere

Do energy change it's forms ?

• Yes

• No

Sound energy is produced by any object that ____________.

• Vibrates

• Still

• Interacts

• None of the above

In a solar power station Solar energy changes into __________.

• Wind energy

• Hydroelectric energy

• Geothermal energy

• Electric energy

__________ is one of the most common forms of energy.

• Electric energy

• Solar energy

• Wind energy

• None of these