Physics
Grade-9
Easy
Question
An electrically neutral material has __________ number of positive and negative charges.
- Equal
- Unequal
- Infinite
- Zero
The correct answer is: Equal
Protons have a positive charge and electrons have a negative charge. Hence, an electrically neutral material has equal number of positive and negative charges.
Related Questions to study
Physics
Unlike charges _______ each other.
Unlike charges _______ each other.
PhysicsGrade-9
Physics
An atom has ___________ charge.
An atom has ___________ charge.
PhysicsGrade-9
Physics
Which of the following cannot be a heat reservoir?
Which of the following cannot be a heat reservoir?
PhysicsGrade-9
Physics
During a thermodynamic process, 30 joules of heat are added to a gas while 25 joules of work are done by the gas. The change in internal energy of a system is ____ J.
During a thermodynamic process, 30 joules of heat are added to a gas while 25 joules of work are done by the gas. The change in internal energy of a system is ____ J.
PhysicsGrade-9
Physics
During an isothermal process 125 J of heat are removed from a trapped gas. Find out the change in internal energy of the system.
During an isothermal process 125 J of heat are removed from a trapped gas. Find out the change in internal energy of the system.
PhysicsGrade-9
Physics
In an isothermal process the change in internal energy of the system is ____.
In an isothermal process the change in internal energy of the system is ____.
PhysicsGrade-9
Physics
During a thermodynamic process, 438 J of heat is removed from a gas system while 238 J of work is done on the gas. The change in internal energy of a system is _____ J.
During a thermodynamic process, 438 J of heat is removed from a gas system while 238 J of work is done on the gas. The change in internal energy of a system is _____ J.
PhysicsGrade-9
Physics
A cold reservoir is touched to a system, which of the following may happen?
A cold reservoir is touched to a system, which of the following may happen?
PhysicsGrade-9
Physics
When there is no heat exchange between the system and the reservoir, ____.
When there is no heat exchange between the system and the reservoir, ____.
PhysicsGrade-9
Physics
The internal energy of a system does not change in a/an _____ process.
(A) Isothermal
(B) Adiabatic
(C) Isochoric
(D) Isobaric
The internal energy of a system does not change in a/an _____ process.
(A) Isothermal
(B) Adiabatic
(C) Isochoric
(D) Isobaric
PhysicsGrade-9
Physics
Energy can be added to a system by ____.
Energy can be added to a system by ____.
PhysicsGrade-9
Physics
Internal energy denotes ______.
Internal energy denotes ______.
PhysicsGrade-9
Physics
When the pressure inside the system is smaller than the pressure outside it, the work is done ______.
When the pressure inside the system is smaller than the pressure outside it, the work is done ______.
PhysicsGrade-9
Physics
During a thermodynamic process, 540 J of heat is removed from a gas system while 1200 J of work done on the gas. The change in internal energy of a system is _______J.
During a thermodynamic process, 540 J of heat is removed from a gas system while 1200 J of work done on the gas. The change in internal energy of a system is _______J.
PhysicsGrade-9
Physics
During a thermodynamic process, 230 joules of heat are added to a gas while 200 joules of work are done by the gas. The change in internal energy of a system is ______ J.
During a thermodynamic process, 230 joules of heat are added to a gas while 200 joules of work are done by the gas. The change in internal energy of a system is ______ J.
PhysicsGrade-9