alleryAs per your syllabus, A · B equals which expression?
- A B (no factor)
- A B cos θ
- A B sin θ
- A B tan θ
Show answer and solution
Correct answer: B. A B cos θ
Your syllabus: scalar (dot) product A · B = AB cos θ.
Maximum at θ = 0; zero at θ = 90°.
Karnataka PUC I Work, Energy and Power — practice questions
Explore 79 free Work, Energy and Power questions in Karnataka PUC I Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 79.
As per your syllabus, A · B equals which expression?Read the answer and worked solution →As per your syllabus, the dot product of two PERPENDICULAR vectors is which value?Read the answer and worked solution →As per your syllabus, î · î (dot product of a unit vector with itself) equals which value?Read the answer and worked solution →As per your syllabus, the WORK done by a constant force F on an object undergoing displacement d is which?Read the answer and worked solution →As per your syllabus, work done by a force perpendicular to the displacement (e.g. centripetal force in UCM) is which?Read the answer and worked solution →As per your syllabus, + Points 2, work done by FRICTION (or viscous force) on a moving body is which?Read the answer and worked solution →As per your syllabus, the KINETIC energy of a body of mass m moving with speed v is which?Read the answer and worked solution →As per your syllabus, the WORK-ENERGY theorem states that net work done equals which quantity?Read the answer and worked solution →As per your syllabus, the kinetic energy is which kind of quantity?Read the answer and worked solution →As per your syllabus, a bullet of mass 50 g at 200 m/s emerges from plywood with 10% of initial KE. The emergent speed is closest to which value?Read the answer and worked solution →As per your syllabus, the dimensions of kinetic energy (and of work) are which?Read the answer and worked solution →As per your syllabus, the scalar product is which property algebraically?Read the answer and worked solution →As per your syllabus, the work done by a VARIABLE force F(x) over displacement from x_i to x_f is which?Read the answer and worked solution →As per your syllabus, the GRAVITATIONAL potential energy of a mass m at height h above the ground (g constant) is which?Read the answer and worked solution →As per your syllabus, / 5.8, a force is CONSERVATIVE if work done over a closed path equals which value?Read the answer and worked solution →As per your syllabus, eqn 5.9, a conservative force F(x) is related to its potential V(x) by which relation?Read the answer and worked solution →As per your syllabus, example, a ball dropped from height h has speed at the ground equal to which value?Read the answer and worked solution →As per your syllabus, is there an associated POTENTIAL ENERGY for FRICTION?Read the answer and worked solution →As per your syllabus, the zero of GRAVITATIONAL potential energy is conventionally chosen at which level?Read the answer and worked solution →As per your syllabus, the dimensions of POTENTIAL energy are the same as those of which quantity?Read the answer and worked solution →As per your syllabus, an object dropped from height h, just before hitting the ground, has kinetic energy equal to which value?Read the answer and worked solution →As per your syllabus, the total mechanical energy E in a conservative system is which sum?Read the answer and worked solution →As per your syllabus, eqn 5.16, Hooke's law for an ideal spring states the spring force F_s is which?Read the answer and worked solution →As per your syllabus, the SI unit of the spring constant k is which?Read the answer and worked solution →As per your syllabus, the elastic potential energy stored in a spring extended by x is which?Read the answer and worked solution →As per your syllabus, Fig 5.8, in a spring-mass system at maximum extension (x = ±x_max), the kinetic energy of the block is which?Read the answer and worked solution →As per your syllabus, Fig 5.8, at the equilibrium position (x = 0) of a spring-mass system, the kinetic energy is which?Read the answer and worked solution →As per your syllabus, AVERAGE power is defined as which ratio?Read the answer and worked solution →As per your syllabus, INSTANTANEOUS power is given by which expression in terms of F and v?Read the answer and worked solution →As per your syllabus, 1 horsepower (hp) is approximately equal to which value?Read the answer and worked solution →
Worked practice questions
As per your syllabus, the dot product of two PERPENDICULAR vectors is which value?
- Equal to product of magnitudes
- Equal to half the product
- Zero
- Negative product
Show answer and solution
Correct answer: C. Zero
Your syllabus: cos 90° = 0 ⇒ A · B = 0. Hence i·j = j·k = k·i = 0 for unit vectors.
As per your syllabus, î · î (dot product of a unit vector with itself) equals which value?
- -1
- 1
- 0
- 2
Show answer and solution
Correct answer: B. 1
Your syllabus: cos 0° = 1 and magnitudes are 1, so î·î = ĵ·ĵ = k̂·k̂ = 1.
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