أسئلة الفيزياء الصف العاشر مع الحل

15 سؤالاً تدريبياً في الفيزياء – الصف العاشر

1. الفصل: Electrostatics · سهل

   1. Which material is an electric conductor?

   • A. copper
   • B. dry wood
   • C. glass
   • D. rubber
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   Answer: copper

   Explanation: Metals contain free electrons.

2. الفصل: Electrostatics · سهل

   2. A body becomes positively charged when it:

   • A. gains electrons
   • B. loses electrons
   • C. loses protons
   • D. gains protons
   أظهر الجواب ▾

   Answer: loses electrons

   Explanation: Only electrons move; losing them leaves a deficit of negative charge.

3. الفصل: Potential Difference · سهل

   3. On an oscilloscope, a DC voltage appears as:

   • A. a sine curve
   • B. a dot that moves up and down
   • C. a vertical line
   • D. a horizontal line moved up or down from the centre
   أظهر الجواب ▾

   Answer: a horizontal line moved up or down from the centre

   Explanation: The voltage is constant in time.

4. الفصل: Potential Difference · سهل

   4. Changing the reference point changes the voltage between two points.

   • A. True
   • B. False
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   Answer: False

   Explanation: False: only the potentials change; their difference stays the same.

5. الفصل: Electric Current · سهل

   5. A current flows only if the circuit is:

   • A. open
   • B. made of plastic
   • C. closed and contains a generator
   • D. connected to an ammeter
   أظهر الجواب ▾

   Answer: closed and contains a generator

   Explanation: An open circuit has no current.

6. الفصل: Electric Current · سهل

   6. The drift velocity of electrons in a wire is close to the speed of light.

   • A. True
   • B. False
   أظهر الجواب ▾

   Answer: False

   Explanation: False: it is about 0.1 mm/s; only the establishment of the current is that fast.

7. الفصل: Resistors · سهل

   7. A current of 0.30 A flows through a resistor R = 100 Ω. What is the voltage across it?

   • A. 333 V
   • B. 3.00 × 10⁴ V
   • C. 30.0 V
   • D. 0.00300 V
   أظهر الجواب ▾

   Answer: 30.0 V

   Explanation: U = R I = 100 × 0.30 = 30.0 V.

8. الفصل: Resistors · سهل

   8. A current of 0.50 A flows through a resistor R = 100 Ω. What is the voltage across it?

   • A. 5.00 × 10⁴ V
   • B. 0.00500 V
   • C. 50.0 V
   • D. 200 V
   أظهر الجواب ▾

   Answer: 50.0 V

   Explanation: U = R I = 100 × 0.50 = 50.0 V.

9. الفصل: Sources of emf – Electric Loads · سهل

   9. The emf of a generator is the voltage between its terminals when:

   • A. it delivers its largest current
   • B. it delivers no current
   • C. it is connected to a motor
   • D. it is short-circuited
   أظهر الجواب ▾

   Answer: it delivers no current

   Explanation: U_PN = E − r × 0 = E.

10. الفصل: Sources of emf – Electric Loads · سهل

    10. Two identical cells in series have twice the emf of one cell.

    • A. True
    • B. False
    أظهر الجواب ▾

    Answer: True

    Explanation: True: E_eq = 2E (and r_eq = 2r).

11. الفصل: Vibrations and Waves · سهل

    11. The relation between period and frequency is:

    • A. f = T²
    • B. f = 1/T
    • C. f = 2T
    • D. f = T
    أظهر الجواب ▾

    Answer: f = 1/T

    Explanation: The frequency is the number of cycles per second.

12. الفصل: Vibrations and Waves · سهل

    12. Sound can travel through a vacuum.

    • A. True
    • B. False
    أظهر الجواب ▾

    Answer: False

    Explanation: False: sound is a mechanical wave; it needs a medium.

13. الفصل: Reflection and Refraction of Waves · سهل

    13. Water waves travel more slowly in:

    • A. neither
    • B. deep water
    • C. shallow water
    • D. both equally
    أظهر الجواب ▾

    Answer: shallow water

    Explanation: The speed of water waves decreases with depth.

14. الفصل: Reflection and Refraction of Waves · سهل

    14. The change of direction of a wave when it passes into a new medium is called:

    • A. echo
    • B. vibration
    • C. refraction
    • D. reflection
    أظهر الجواب ▾

    Answer: refraction

    Explanation: Refraction comes from the change of speed.

15. الفصل: Rectilinear Propagation of Light · سهل

    15. The speed of light in vacuum is about:

    • A. 340 m/s
    • B. 3.0 × 10⁸ m/s
    • C. 3.0 × 10⁵ m/s
    • D. 3.0 × 10⁸ km/s
    أظهر الجواب ▾

    Answer: 3.0 × 10⁸ m/s

    Explanation: c = 3.0 × 10⁸ m/s = 3.0 × 10⁵ km/s.

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