# HBSE Class 12 Physics SAT-1 Question Paper 2024 Answer Key

Haryana Board (HBSE) Class 12 Physics SAT-1 Question Paper 2024 PDF Download. SAT (Students Assessment Test). HBSE Class 12 Physics SAT Question Paper 2024. Haryana Board Class 12 Physics Students Assessment Test 2024. HBSE Class 12th Physics SAT 2024 Answer. Haryana Board Class 12 Students Assessment Test. Haryana Board Class 12 Physics SAT Paper 2024 Solution. हरियाणा बोर्ड कक्षा 12 भौतिक विज्ञान SAT पेपर 2024.

HBSE Class 12 Physics SAT-1 Question Paper 2024 Answer Key

Instructions :
• All questions are compulsory.
• Questions (1-9) carry 1 mark each.
• Questions (10-12) carry 2 marks each.
• Questions (13-14) carry 3 marks each.
• Question (15) case study, carry 4 marks.
• Questions (16-17) carry 5 marks each.

1. The SI unit of magnetic dipole moment of a bar magnet is :
(a) Am–2
(b) Am–1
(c) Am
(d) Am2
Answer – (d) Am2

2. Direction of induced e.m.f. is given by :
(a) Faraday’s first law
(b) Faraday’s second law
(c) Lenz’s law
(d) Huygen principle
Answer – (c) Lenz’s law

3. Above curie temperature, a
(a) ferromagnetic material becomes diamagnetic
(b) ferromagnetic material becomes paramagnetic
(c) paramagnetic material becomes ferromagnetic
(d) paramagnetic material becomes diamagnetic
Answer – (b) ferromagnetic material becomes paramagnetic

4. The best instrument for accurate measurement of e.m.f. of a cell is :
(a) Wheatstone bridge
(b) Ammeter
(c) A Potentiometer
(d) Voltmeter
Answer – (c) A Potentiometer

5. Sl unit of magnetic flux is ………….

6. Energy stored in capacitor is …………

7. Are Kirchhoff’s rules applicable to both alternating current (AC) and direct current (DC) circuits?

8. Write the relation, connecting current density (J) and conductivity (σ) of the conductor, when an electric field (E) is applied.
Answer – Current density, J = σ E

9. Assertion (A) : In a uniform Electric Field, electrons move in the opposite direction of Electric Field.
Reason (R) : This is because of the negative charge of an electron.
Answer – Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

10. When the distance between two charged particles is made one-fourth, the force between them becomes.
Answer – Force, F = k(q1q2)/r2
New Force, F’ = k(q1q2) / (r/4)2 = 16 k(q1q2)/r2 = 16F
New force is sixteen times of previous force.

11. On which factors does the capacitance of a capacitor depend?
Answer – The capacitance of a capacitor depends on area of each plate, dielectric medium between the plates and distance between the plates.

12. State ampere’s circuital law.
Answer – Ampere’s circuital law states that, the line integral of the magnetic field surrounding closed loop equals to the number of times the algebraic sum of currents passing through the loop.

13. Write Faraday’s laws of Electromagnetic induction.
Answer : Faraday’s 1st law – Whenever there is a change in the magnetic flux linked with the circuit changes an e.m.f is induced in it. It lasts so long as the change in the flux continues.
• Faraday’s 2nd law – The rate of change of magnetic flux linked with a circuit is directly proportional to e.m.f induced.

14. Define drift velocity? Establish the relation between current and drift velocity.
Answer – Drift velocity is defined as the average velocity with which the free electrons get drifted towards the positive end of the conductor under the influence of an external electric field.
Current (I) = neAvd

15. CASE STUDY : Static electricity is built up of an electrical charge on the surface of an object. We see static electricity everyday. When our dry hair is dressed with a plastic comb, our hair gets charged. Lightning is a powerful form of static electricity. Atoms are made up of tiny particles called neutrons, protons and electrons. The neutrons and protons together form the nucleus. The electrons revolve around the outside of the nucleus. A static charge is formed when two surfaces are rubbed against each other and the electrons move from one object to another.
Questions :
(i) Which atomic particle moves from one surface to another in order to form static charge?
(a) Electrons
(b) Protons
(c) Neutrons
(d) All of the above
Answer – (a) Electrons

(ii) When a charged rod is brought near a neutral paper piece, then charged rod :
(a) Attracts the paper piece
(b) Repels the paper piece
(c) Neither attract nor repel the paper piece
(d) None of the above
Answer – (a) Attracts the paper piece

(iii) Which of the following is the practical application for static electricity?
(a) Air filters
(b) Photocopier
(c) Laser printers
(d) All of the above
Answer – (d) All of the above

(iv) Which of the following is an example of static electricity?
(a) Electricity for a light bulb
(b) An electric socket in your home
(c) Your pants sticking to your legs
(d) None of the above

16. Write the characteristics of electric field lines.
Answer – Characteristics of electric field lines are following :
(i) Electric field lines always start from a positive charge and end at a negative charge.
(ii) Electric field lines never cross each other.
(iii) Electric field lines are always perpendicular to the surface of a conductor.
(iv) Electric field lines can be curved or straight, depending on the configuration of the charges producing the field.
(v) The closer the electric field lines are to each other, the stronger the electric field at that point.

17. Explain principle and working moving coil Galvanometer.
Answer – A moving coil galvanometer is an instrument which is used to measure electric currents. It is a sensitive electromagnetic device which can measure low currents even of the order of a few microamperes.
• Principle – When a current flows through the coil, a torque acts on it. The magnetic torque tends to rotate the coil. Spring provides a counter torque that balances the magnetic torque resulting in a steady angular deflection.

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