Q:1-An object is to be lifted from the ground to a height of 5m in 25 seconds. If the energy consumed during the process is 2000 J, what is the power required?
Mark one answer:
75 J/s
72 J/s
80 J/s
100 J/s

Q:6-What is the dipole moment between an electron and a proton separated by a distance of 1 nm?
Mark one answer:
3.8 × 10 ^-28 Cm
4.5 × 10 ^-28 Cm
4.5 × 10 ^-26 Cm
1.6 × 10 ^-28 Cm

Q:7-For a conductor having a cross section of 2 × 10 ^-4 m², average drift velocity of the electrons flowing through it is 10 ^-3 m/s . If the density of free electrons in the conductor is 6 × 10 ^-24 m^-3, what is the current flowing through the conductor? (Charge on electron = 1.6 × 10 ^-19 C)
Mark one answer:
0.45 A
0.19 A
0.27 A
0.31 A

Q:8-A long straight conductor carries a current of 2 A. What would be the magnetic field at a distance of 0.05 m from the axis of the conductor? (Permeability of free space is 4π × 10^-7 WbA^-1m^-1 )
Mark one answer:
8 × 10 ^-6 T
4 × 10 ^-6 T
2.5 × 10 ^-6 T
1.5 × 10 ^-6 T

Q:9-A small water drop on a surface is viewed through a glass. If the real depth of the water drop is 15 cm, what will be the apparent depth of the water drop? (Refractive index of glass =1.5 and refractive index of air = 1)
Mark one answer:
5 cm
10 cm
8.4 cm
1.5 cm

Q:10-Work function of Nickel is 5.01 eV. What is the threshold frequency for Nickel? (Planck’s constant = 6.6 × 10 ^-34 Js)
Mark one answer:
1.21 × 10 ¹⁵ Hz
0.56 × 10 ¹⁵ Hz
4.56 × 10 ¹⁵ Hz
3.67 × 10 ¹⁴ Hz