ICSE Class 9 Physics Question Paper. We covered all the ICSE Class 9 Physics Question Paper in this post for free so that you can practice well for the exam.
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ICSE Class 9 Physics QnA for Students
A gas does 4.5 J of external work during adiabatic expansion. Its temperature falls by 2 K. Its internal energy will :
(A) Increase by 4.5 J
(B) Decrease by 4.5 J
(C) Decrease by 2.25 J
(D) Increase by 9 J
Option b – Decrease by 4.5 J
An ideal gas is enclosed in a cylinder-piston arrangement and undergoes adiabatic compression. The work done on the gas is 4 J. Which of the following statement is correct? :
(A) dQ = 0, dU = 0, dW = 4J
(B) dQ = 0, dU =4 J dW = -4J
(C) dQ = 0, dU = 4 J, dW = 4 J
(D) dQ = 0, dU = -4 J, dW = 4J
Option b – dQ = 0, dU =4 J dW = -4J
Heat given to a system is 35 J and work done by the system is 15 J. The change in the internal energy of the system will be :
(A) – 50 J
(B) 20 J
(C) 30 J
(D) 50 J
Option b – 20 J
A thermodynamical system absorbs 100 cal of heat and performs 30 J of work. If J = 4.2 J/cal, the change in its internal energy will be :
(A) 14 J
(B) 390 J
(C) 150 J
(D) 450 J
Option b – 390 J
When the amount of work done is 333 cal and the change in internal energy is 167 cal, then the heat supplied is.
(A) 166 cal
(B) 333 cal
(C) 500 cal
(D) 400 cal
Option c – 500 cal
In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas released 20 J of heat and 8 J of work was done on the gas. If the initial internal energy of the gas was 30 J, then the final internal energy will be :
(A) 2 J
(B) 42 J
(C) 18 J
(D) 58 J
Option c – 18 J
During the adiabatic expansion of 2 moles of a gas, the change in the internal energy was found to be – 100 J. The work done during the process was :
(A) Zero
(B) – 100 J
(C) 200 J
(D) 100 J
Option d – 100 J
During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2J. The work done during the process by gas will be equal to :
(A) 1 J
(B) -1 J
(C) 2 J
(D) – 2J
Option c – 2 J
In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out 30 J of heat, and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be :
(A) Zero
(B) 80 J
(C) 20 J
(D) – 20 J
Option c – 20 J
A gas receives an amount of heat equal to 210 J and performs 140 J of work. The change in the internal energy of the gas is :
(A) 70 J
(B) 110 J
(C) 150 J
(D) 40 J
Option a – 70 J
One mole of an ideal gas requires 207 J to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10K, the heat required is (Given: Universal gas constant R= 8.3 J/mol K) :
(A) 215.3 J
(B) 124 J
(C) 29 J
(D) 198.7 J
Option b – 124 J
Which of the following cannot determine the state of a thermodynamic system?:
(A) Pressure and volume
(B) Volume and temperature
(C) Temperature and pressure
(D) Any one of pressure, volume, or temperature
Option d – Any one of pressure, volume, or temperature
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