Q1. What is the SI unit of force?
Correct: Newton
The Newton (N) is the SI unit of force, defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.
Q2. Which law states that the current through a conductor is directly proportional to the voltage across it?
Correct: Ohm's Law
Ohm's Law states that V = IR, where voltage (V) is directly proportional to current (I) when resistance (R) is constant.
Q3. What type of stress occurs when forces act to stretch or elongate a material?
Correct: Tensile stress
Tensile stress occurs when forces act to pull or stretch a material, causing it to elongate. It is calculated as force divided by cross-sectional area.
Q4. In thermodynamics, which law states that energy cannot be created or destroyed?
Correct: First Law
The First Law of Thermodynamics is the law of conservation of energy, stating that energy can only be converted from one form to another, not created or destroyed.
Q5. What is the primary function of a diode in an electrical circuit?
Correct: To allow current flow in one direction only
A diode is a semiconductor device that allows current to flow in one direction (forward bias) while blocking it in the opposite direction (reverse bias).
Q6. What is the moment of a force also known as?
Correct: Torque
The moment of a force, or torque, is the rotational effect produced by a force applied at a distance from a pivot point. It equals force multiplied by perpendicular distance.
Q7. Which material property describes a material's ability to resist deformation under stress?
Correct: Stiffness
Stiffness, measured by the modulus of elasticity (Young's modulus), describes how much a material resists elastic deformation when stress is applied.
Q8. In a DC circuit, what is the power dissipated by a resistor if the current through it is 2A and the resistance is 10Ω?
Correct: 40W
Power is calculated using P = I²R = (2)² × 10 = 4 × 10 = 40 watts.
Q9. What does CAD stand for in engineering design?
Correct: Computer Aided Design
CAD stands for Computer Aided Design, which is software used by engineers and designers to create precision drawings and technical illustrations.
Q10. What is the efficiency of a machine that does 600J of useful work when supplied with 800J of energy?
Correct: 75%
Efficiency = (Useful work output / Energy input) × 100 = (600 / 800) × 100 = 75%.
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