Amar made an electric circuit using a torch bulb, a cell, a switch and connection wires. The bulb didn’t glow when he made the switch ON. What can be the possible reasons for it?

Which of the following statements are true for an isothermal process? check all that apply. - during an isothermal process, the work done by the gas equals the heat added to the gas. - during an isothermal process, the internal energy of the system changes. - an isothermal process is carried out at constant temperature. - an isothermal process is carried out at constant pressure. - an isothermal process is carried out at constant volume.

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed

Answer fast! which lens can produce a virtual image and a real image? concave lens convex lens flat lens