أسئلة تدريبية في الفيزياء – الصف الحادي عشر – المنهج اللبناني

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سجّل على edurise.me واشترك (10 دولارات شهرياً) لتتدرّب على كل فصول الفيزياء للصف الحادي عشر، وتقدّم الامتحانات المؤقّتة وتتابع تقدّمك.

Question 1

In non-uniform circular motion the acceleration is directed exactly toward the centre.

Accepted Answer

False. False: it also has a tangential component a_t = dV/dt.

Question 2

The position vector of a point M is OM = x i + y j.

Accepted Answer

True. True: x and y are the coordinates of M in the frame (O, i, j).

Question 3

The acceleration of a body can be opposite to its velocity.

Accepted Answer

True. True: a braking car has a opposite to V.

Question 4

A cart moves at constant velocity on a horizontal track. The resultant force on it is:

Accepted Answer

zero. Constant velocity ⇔ a = 0 ⇔ ΣF = 0.

Question 5

In a perfectly inelastic collision:

Accepted Answer

momentum is conserved but kinetic energy is not. The bodies stick together; part of the kinetic energy becomes heat and deformation.

Question 6

The sum of all the internal forces of a system is:

Accepted Answer

zero. Internal forces come in opposite pairs (Newton's third law).

Question 7

Doubling the thickness of a wall halves the heat flux through it (same materials, same temperatures).

Accepted Answer

True. True: Φ = λ S ΔT/e is inversely proportional to e.

Question 8

Heat flows spontaneously:

Accepted Answer

from the hotter body to the colder body. Heat is energy transferred because of a temperature difference, from hot to cold.

Question 9

A couple can make a body rotate although the resultant of its forces is zero.

Accepted Answer

True. True: its moment F d is not zero.

Question 10

Two points of a turning wheel at different distances from the axis have the same speed.

Accepted Answer

False. False: same ω, but v = rω depends on r.

Question 11

Stretching a spring by 4 cm needs twice the work needed to stretch it by 2 cm.

Accepted Answer

False. False: ½ k x², so 4 times the work.

Question 12

Kinetic energy can be negative.

Accepted Answer

False. False: KE = ½ m v² ≥ 0.

Question 13

Two point charges q₁ = +4.0 μC and q₂ = −3.0 μC are 0.10 m apart in air (k = 9 × 10⁹ N·m²/C²). The force between them is:

Accepted Answer

10.8 N, attractive. F = k|q₁q₂|/d² = 9 × 10⁹ × 4.0 × 10⁻⁶ × 3.0 × 10⁻⁶ / 0.10² = 10.8 N; the charges have opposite signs: attraction.

Question 14

Two parallel plates 10 mm apart are connected to a voltage U = 500 V. The field between them is:

Accepted Answer

5.00 × 10⁴ V/m. E = U/d = 500/0.010 = 5.00 × 10⁴ V/m (d in metres).

Question 15

Beyond its breakdown voltage the dielectric lets a spark through.

Accepted Answer

True. True: U > E_max·e destroys the capacitor.

أسئلة الفيزياء الصف الحادي عشر مع الحل

15 سؤالاً تدريبياً في الفيزياء – الصف الحادي عشر

1. In non-uniform circular motion the acceleration is directed exactly toward the centre.

2. The position vector of a point M is OM = x i + y j.

3. The acceleration of a body can be opposite to its velocity.

4. A cart moves at constant velocity on a horizontal track. The resultant force on it is:

5. In a perfectly inelastic collision:

6. The sum of all the internal forces of a system is:

7. Doubling the thickness of a wall halves the heat flux through it (same materials, same temperatures).

8. Heat flows spontaneously:

9. A couple can make a body rotate although the resultant of its forces is zero.

10. Two points of a turning wheel at different distances from the axis have the same speed.

11. Stretching a spring by 4 cm needs twice the work needed to stretch it by 2 cm.

12. Kinetic energy can be negative.

13. Two point charges q₁ = +4.0 μC and q₂ = −3.0 μC are 0.10 m apart in air (k = 9 × 10⁹ N·m²/C²). The force between them is:

14. Two parallel plates 10 mm apart are connected to a voltage U = 500 V. The field between them is:

15. Beyond its breakdown voltage the dielectric lets a spark through.

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