ECAT Physics — Vectors and Equilibrium
Vectors and Equilibrium is part of the Physics section of the UET ECAT (30 of the 100 MCQs). It breaks into 3 subtopics, and we hold 20 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (3)
How Vectors and Equilibrium is tested
Across the 7 ECAT past papers on ParhaiKrlo, Vectors and Equilibrium accounts for 3 questions. It appears in 2 of them, about 1.5 questions a paper. The heaviest was ECAT Past Paper 06, with 2 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 06 | 2 |
| ECAT Past Paper 01 | 1 |
Vectors and Equilibrium MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 06 · Vectors and Equilibrium
Which one of the following is NOT a vector quantity?
- A.Kinetic energy
- B.Momentum
- C.Acceleration
- D.Force
Show answer
Answer: A. Kinetic energy — Kinetic energy (½mv²) has magnitude only; momentum, acceleration and force have direction too.
- Q2 · ECAT Past Paper 01 · Vectors and Equilibrium
The reverse process of vector addition is:
- A.Subtraction
- B.Division
- C.Multiplication
- D.None of these
Show answer
Answer: D. None of these — Splitting one vector into components is called resolution of vectors, the reverse of adding them.
- Q3 · ECAT Past Paper 06 · Vectors and Equilibrium
A uniform bar AE of weight 9 N has points A, B, C, D, E equally spaced along it (C is the middle). It is held horizontal by vertical forces: 5 N upward at A, 2 N downward at D, and one more upward force of 6 N. At which point must the 6 N force act to keep the bar in equilibrium?
- A.Point D
- B.Point E
- C.Point C
- D.Point B
Show answer
Answer: B. Point E — Forces balance (5 + 6 = 9 + 2). Taking moments about A with spacing a: 6x = 9(2a) + 2(3a) = 24a, so x = 4a — point E.