State the three broad classifications of the apparatus in a physics laboratory.

Define the least count of screw gauge. Give one example.

Write the names of three devices needed in the maintenance of electric and electronic equipments.

What precautions should you take to avoid injuring yourself while working with a soldering iron?

Define the magnifying power of a convex lens. Write one application of a convex lens.

State three precautions you should observe while using a physical balance.

Calculate the resistance of the resistor having the following colour code Brown, Blue, Green, Silver

What steps should you take after opening the Physics lab at the start of the day and before locking it up when work ends

List any three apparatus usually kept in a dark room attached to the Physics lab.

A 5 cm high object is placed in front of a concave mirror of focal length 15 em and its 1 em high image is projected on the screen. Calculate the position of the object.

Draw the ray diagram for the image formed by a convex lens when the object is at 2F.

In a resistance box, what is the resistance when ,all gaps are plugged, and

In a resistance box, what is the resistance when ,the plugs from gaps marked 20 ohms, 50 ohms and 100 ohms are taken out?

A transformer has a rating 240V/12V; 1 Watt. What is the maximum current that can be allowed in the primary and secondary coils?

Write any two reasons for a permanent magnet to lose its magnetism.

Draw the circuit diagram of Wheatstone bridge for the resistance measurement and explain its working.