Light: Shadows and Reflections — Science STD 7 — Question

Why can’t Mercury or Venus block the Sun completely?

Arteries have a very thick and elastic walls. Why?

The patterns of magnetic field lines outside a solenoid are parallel curved lines. What does this indicate?

Name the process where water from the soil seeps into the ground to become part of the groundwater.

Salma takes 15 min from her house to reach school on a bicycle. If the bicycle has a speed of 2m/ s, calculate the distance between her house and the school.

What is osmoregulation?

Urinary bladder is the part of human excretory system. What is its role in excretion?

From which organ of digestive system, the undigested faecal matter is removed?

In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?

Briefly mention what makes things visible to us.