» CBSE Physics Model Question Paper- I : CBSE Sample Question Papers

1. Define dielectric constant in terms of capacity.
Answer

2. Is ‘dry’ cell a primary or a secondary cell
Answer

3. Give the range of wavelengths of e.m. spectra sensitive to human eye.
Answer

4. What is nuclear holocast ?
Answer

5. What is approximately the value of specific charge of an electron in SI ?
Answer

6. What is Albedo of a planet ?
Answer

7. Define wavefront and a ray of light.
Answer

8. Write down Biot-Savart’s law in vector form.
Answer

9. What is Hubble effect ? What does this tell about universe ?
Answer

10. What is Bohr magneton ? What is its value in SI ?
Answer

11. What is critical angle ? How the earth appears to a fish in water ?
Answer

12. Why ₉₂U²³⁸ cannot be used instead of ₉₂U²³⁵ in nuclear fission ?
Answer

13. Identify the logical gate 1 and 2 in the logic circuit given. Also write down Boolean equation for the truth table for the combination.
Image
Answer

14. What is binding energy and the mass defect ? Whicbrnucleus has least binding energy ?
Answer

15. What does an e.m. wave consist of ? On what factor does its velocity in vacuum depend ?
Answer

16. What is Malus law ? What will be the intensity in the plane inclined at an angle of 60° ?
Answer

17. Tips of an aeroplane are 20 m apart moving with a velocity of 720 km h-1 in earths field of
H = 0. 4 X 10^-4 T if the wings of the aeroplane are along E–W direction.
Answer

18. Calculate the capacity of a capacitor when used in series with inductance of 5H will cause the circuit to resonant at 50,000 Hz.
Answer

19. Why are the core of transformer laminated ?
Answer

20. Derive an expression for average power of an A.C. circuit containing L, C and R.
Answer

21. Derive an expression for capacitance of a parallel plate capacitor with a dielectric slab.
Answer

22. A straight conductor 1 m long moves at right angles to both its length and a uniform magnetic field. If the speed of the conductor is 2 ms-1 ^{and strength of the field is 104 gauss find the value of induced emf in volt.
Answer}

23. What are microwaves ? To what use are these put to ?
Answer

24. In Wheatstone’s bridge P = 1 Ω,Ω = 2 Ω, R = 2Ω, S = 3Ω. A galvanometer of resistance 4 Ωis put across B and C. A cell of emf 2 V and internal resistance 2Ω is connected across A and C. Find the current in unbalanced Wheatstone’s bridge.
Answer

25. What is electron theory of magnetism ? Show how it explains the behaviour of a diamagnetic substance placed in magnetic field.
Answer

26. Deduce the relation between the distance of object, distance of image, refractive indices and radius of curvature when light passes from an optically denser medium at concave refracting surface.
Answer

27. Calculate resistance of 500 g of copper wire of diameter 0. 8 cm. Given the density of copper = 8 .9 g cm^-3 and resistivity of copper = 1.5 x 10 -6 ohm cm.
Answer

28. Why is A.C. usually transmitted at high voltage ? Illustrate by considering an example. Why donot we transmit D.C. to distant station ?

OR

A stream of electrons moving with a velocity of 3 X 10⁷ ms^-1 is deflected by 2 mm in travelling through a distance of 0 . 1 m in the uniform magnetic field 18 V cm^-1 . Find the ratio of elm.
Answer

29. How can a direct current be converted into very high frequency A.C? To what use is it put to? Explain by giving a neat and labelled diagram.
Answer

30. What is nuclear fission and nuclear fusion? In which case more energy is produced? Discuss the effect of nuclear fall out.
Answer