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Punjab (PTB) · Half book test (board pattern) · Free

10th Class Physics Second half Book Paper

60 marks · About 2 hours (objective and subjective) · 39 questions. Covers: 6 chapters (CHAP 16: ELECTRICITY to CHAP 21: SPACE AND ENVIRONMENT).

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10th Class Physics Second half Book Paper

10th Class · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 60Time: About 2 hours (objective and subjective)

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. Half life of Uranium is:

    1. 4.5 billion years

    2. 4.6 billion years

    3. 4.7 billion years

    4. 4.8 billion years

  2. Which statement is correct:

    1. Magnetic field lines always from closd loops

    2. Magnetic field lines always from ditanced loops

    3. Magnetic field lines never come from a bar magnet

    4. All are correct

  3. The current was considered to be due to flow of only positive charges, named as:

    1. Conventonal current

    2. Diretc current

    3. Indirect current

    4. Alternating current

  4. In a transformer, energy is transferred from the primary coil to the secondary coil through:

    1. Direct electrical connection

    2. A magnetic field in the iron core

    3. Electron flowing through the core

    4. Heat conduction

  5. What fuels hurricanes and makes them stronger and more destructive?

    1. Freezing temperatures

    2. Heat absorbed by the ocean

    3. Tectonic plate movements

    4. Geysers and hot springs

  6. The process of adding impurities to a pure semi condutor is called:

    1. Annealing

    2. Doping

    3. Heating

    4. Diffusion

  7. Theoretically, a single gram of matter can be converted into enough energy to power a ...... for days.

    1. Small lamp

    2. Complete city

    3. Single house

    4. Calculator

  8. Which rule is used to determine the direction of the force acting on a current-carrying conductor in a magnetic field?

    1. Right-hand grip rule

    2. Fleming's left-hand rule

    3. Ohm's law

    4. Joule's law

  9. A typical main circuit consist of wires:

    1. Two

    2. Three

    3. Four

    4. Five

  10. If we stop moving magnet near a coil:

    1. Current will increase

    2. Current will decrease

    3. Current becomes zero

    4. Remain contant

  11. Sun contains helium:

    1. 20%

    2. 24%

    3. 30%

    4. 74%

  12. What does the small bubble circle at the output of a NAND or NOR gate symbol represent?

    1. Amplification

    2. Inversion

    3. High voltage

    4. Ground connection

Q2. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. What is Joule's Law?

  2. What are three important properties of magnetic field lines?

  3. Name three sectors or areas where lighting plays a key role.

  4. How does placing a wire at different angles to a magnetic field affect the magnetic force it experiences, and why is this important in designing motors?

  5. What is the formula for calculating the quivalent resistance of resistance of resistors connected in series?

  6. What is the source of the Earth's magnetic field according to the theory?

  7. Why birds remains safe while sitting on the electric wire?

  8. State the right-hand grip rule for finding the magnetic field direction around a straight wire.

Q3. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. By adding resistance in loop with constant speed product of current remain same or changed?

  2. Solve the left "Brain Teaser": Show how a NOR gate followed by a NOT gate acts as an OR gate.

  3. What are the benefits of electromagnetic waves?

  4.  Draw or describe the symbolic representation of a semiconductor diode.

  5. Is it possible to change the direction of electron beam?

  6. Define Boolean Algebra and state its significance in computing.

  7. How does the fluorescent screen display the waveform?

  8. What is the role of an AND gate in digital circuits?

Q4. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. Define isotopes.

  2. What is global warming? write few causes of it?

  3. What is Dalton theory of atomic model?

  4. What is the role of energy coming from sun?

  5. Differentiate between Charge Number and Mass Number.

  6. Why do cyclones weaken when they move over land?

  7. If an atom is mostly empty space, why do not we fall through solid objects or pass through walls?

  8. What are the safety measures during radiation exposure?

Q5. Long questions (Attempt any 2 of 3 · 2 × 9 = 18)

  1. Explain how the depletion region of a diode changes in forward and reverse bias. What effect does this have on current flow?

  2. What are the major sources of background radiation, and how does human activities contribute to it?

  3. Define radioactive decay? Explain how radioactive decay help an unstable atom to change in stable one?