Major Competitive Exams

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Q. In an electric circuit, if the voltage is 12 V and the current is 3 A, what is the power?
  • A. 36 W
  • B. 9 W
  • C. 4 W
  • D. 12 W
Q. In an electric circuit, if the voltage is doubled while the resistance remains constant, what happens to the power?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. In an electrochemical cell, the anode is where: (2019)
  • A. Oxidation occurs
  • B. Reduction occurs
  • C. Electrons are gained
  • D. Ions are produced
Q. In an endothermic reaction, the enthalpy of the products is ____ than that of the reactants.
  • A. higher
  • B. lower
  • C. equal
  • D. unpredictable
Q. In an experiment, a student measures the mass of an object as 200 g with an uncertainty of ±5 g. What is the range of possible values for the mass?
  • A. 195 g to 205 g
  • B. 200 g to 210 g
  • C. 195 g to 210 g
  • D. 200 g to 205 g
Q. In an experiment, the length of a rod is measured as 12.0 m with an uncertainty of ±0.5 m. What is the total uncertainty if the length is used in a calculation involving multiplication by 3?
  • A. ±1.5 m
  • B. ±0.5 m
  • C. ±0.75 m
  • D. ±0.25 m
Q. In an experiment, the mass of an object is measured as 5.0 kg with an uncertainty of ±0.2 kg. What is the absolute error?
  • A. 0.2 kg
  • B. 0.5 kg
  • C. 0.1 kg
  • D. 0.3 kg
Q. In an experiment, the measured value of a voltage is 12.0 V with an uncertainty of ±0.2 V. What is the maximum possible error?
  • A. 0.2 V
  • B. 0.1 V
  • C. 0.5 V
  • D. 0.0 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.3 V. What is the absolute error in the voltage measurement?
  • A. 0.3 V
  • B. 0.25 V
  • C. 0.5 V
  • D. 0.1 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.5 V. What is the maximum possible error in the voltage measurement?
  • A. 0.5 V
  • B. 0.25 V
  • C. 1 V
  • D. 0.1 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.5 V. What is the absolute error in the voltage measurement?
  • A. 0.5 V
  • B. 0.05 V
  • C. 5 V
  • D. 1 V
Q. In an ideal gas, the average kinetic energy of a molecule is directly proportional to which of the following?
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Number of molecules
Q. In an ideal gas, the average kinetic energy of a molecule is directly proportional to:
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Density
Q. In an ideal gas, the mean free path is defined as the average distance a molecule travels between collisions. Which factor does NOT affect the mean free path?
  • A. Temperature of the gas.
  • B. Density of the gas.
  • C. Size of the gas molecules.
  • D. Color of the gas molecules.
Q. In an ideal gas, the pressure is directly proportional to which of the following?
  • A. Volume
  • B. Temperature
  • C. Number of moles
  • D. Density
Q. In an ideal gas, the root mean square speed of the gas molecules is given by which of the following formulas?
  • A. v_rms = √(3RT/M)
  • B. v_rms = √(RT/M)
  • C. v_rms = √(2RT/M)
  • D. v_rms = √(R/M)
Q. In an ideal gas, the volume occupied by the gas molecules is:
  • A. Negligible compared to the total volume
  • B. Equal to the total volume
  • C. Greater than the total volume
  • D. None of the above
Q. In an ideal gas, which of the following quantities is constant during an isothermal process?
  • A. Pressure.
  • B. Volume.
  • C. Temperature.
  • D. Number of moles.
Q. In an ideal solution, the enthalpy of mixing is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Varies with concentration
Q. In an irreversible process, the change in entropy of the universe is:
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Undefined
Q. In an isochoric process, the volume of the system:
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Varies with temperature
Q. In an isochoric process, what happens to the internal energy of a gas when heat is added?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It depends on the gas
Q. In an isochoric process, what happens to the internal energy of an ideal gas when heat is added?
  • A. It decreases.
  • B. It remains constant.
  • C. It increases.
  • D. It depends on the amount of heat added.
Q. In an isochoric process, what remains constant? (2021)
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Heat
Q. In an isochoric process, which of the following remains constant? (2022)
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Internal Energy
Q. In an isothermal process for an ideal gas, which of the following is true?
  • A. The internal energy remains constant.
  • B. The temperature increases.
  • C. The pressure decreases.
  • D. The volume remains constant.
Q. In an isothermal process, how does the internal energy of an ideal gas change?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the amount of gas
Q. In an isothermal process, the change in internal energy is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the system
Q. In an isothermal process, the change in internal energy of an ideal gas is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Depends on the amount of gas
Q. In an isothermal process, the internal energy of an ideal gas:
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the amount of gas
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