WorksheetsBRAIN DIGGER QUIZ
Total questions: 30
Worksheet time: 44mins
2. The peak current in a resistor is 1.5 A when a sinusoidal AC of rms voltage 15 V is connected across it. What is the resistance of the wire?
20.14 A
14.14 A
16.14 A
13.14 A
A pure inductor of inductance 2 mH is connected to a 10 V, 1 kHz AC supply. Determine the current flowing through the inductor.
1.40 A
0.25 A
0.79 A
1.60 A
Which best describes the image of a concave mirror when an object is located at a point between the focal point and the centre of curvature of mirror?
Real, inverted and magnification greater than one.
Virtual, upright and magnification less than one.
Real, inverted and magnification less than one
Virtual, upright and magnification greater than one
Two materials with n1 < n2 are arranged in layers of uniform thickness. A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle θ in air. What is the value of θ?
Some angle more than 30°.
Some angle less than 30°.
30°
None of above
A lamp is placed 1 m from a screen. A converging lens of focal length 24 cm is placed between the lamp and the screen. The image of the filament is formed on the screen. As the lens position is moved between the lamp and screen,
a sharp image will be seen when the lens is 40 cm from the lamp
a sharp image will be seen when the lens is 60 cm from the lamp.
a sharp image will be seen when the lens is halfway between the lamp and the screen
a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp
Which of the following statements is TRUE concerning two monochromatic light waves that are coherent?
They have a constant phase difference
They have almost the same amplitude
They have constructive disturbances
They have same phase
If a wave from one slit of a Young’s double-slit set-up arrives at certain point on the screen is one wavelength behind the wave from the other slit. What is observed at that point?
gray fringe
dark fringe
bright fringe
multi-colored fringe
Two narrow slits are 0.025 mm apart. When a laser shines on them, bright fringes form on a screen that is a meter away. These fringes are 3.0 cm apart. What is the separation between the second order bright fringe and the central fringe?
2.6 cm
5.3 cm
6.0 cm
8.6 cm
A photon of energy 4.5 eV imparts all its energy to an electron that leaves a metal surface with 1.6 eV of kinetic energy. What is the work function Wo of the metal?
1.6 eV
2.9 eV
6.1 eV
7.2 eV
A beam of light of a certain frequency is incident on a cold metal surface which has a work function of 3.0 eV. The maximum kinetic energy of the photoelectron produced is 2.0 eV. If the frequency of the incident light is doubled, what is the maximum kinetic energy of the photoelectron?
3.0 eV
5.0 eV
7.0 eV
13.0 eV
Which one of the following statements is TRUE about wave-particle duality?
Evidence that light behaves like particle
Light consists of packages of energy known as photon
The ability of light to have both waves and particle characteristics simultaneously
Light exhibits wave properties such as interference, diffraction and polarization.
The wave like nature of electrons is suggested by experiment concerning
electron diffraction by crystalline substances.
line spectrum of hydrogen atoms.
photoelectric effect
X-ray production
Which of the following is the advantage of using an electron microscope?
Resolving power of electron microscope is better than optical microscope.
Resolving power of electron microscope is less than optical microscope.
The wavelength of the electron beam is longer.
The electron beam is monochromatic.
Which of the following quantities are conserved in a nuclear reaction?
Charge and nucleon number
Momentum and kinetic energy
Momentum and neutron number
Kinetic energy and proton number
The reaction energy, Q of a nuclear reaction is equal to
the endothermic.
the total charge involved.
the energy associated with the change in mass.
the energy associated with momentum conservation.
An inductor of inductance L, a 10 Ω resistor and a 100 μF capacitor is connected in series. Calculate the inductance if the circuit resonates at 100 Hz.
0.025 H
0.159 H
1.005 H
39.50 H
Which of the following best describes the image of a concave mirror when an object is located at a distance greater than twice the focal length?
Virtual, upright and magnification greater than one.
Real, inverted and magnification greater than one.
Virtual, upright and magnification less than one.
Real, inverted and magnification less than one
A 100 cm focal length thin lens is placed in contact with one of 66.7 cm focal length. An object is placed 50 cm in front of the combination. What is the image distance of final image?
200 cm
-200 cm
3.33 cm
50.33 cm
Light traveling at an angle into a denser medium is refracted
towards the normal
away from the normal
parallel to the normal
parallel to the interface between the medium
A monochromatic light is incident on two parallel slits to form interference fringes on a screen. Which of the following changes will make the fringes closer?
The slits separation is reduced.
Wavelength of the light is reduced
The distance from the source to the slits is reduced
The distance between the screen and the slits is increased
In a Young’s double-slit experiment, the distance between the screen and the slits is 1.5 m, and the separation between the two slits is 0.05 mm. If the fringe separation is 3.0 cm, what is the wavelength of the light?
1000 nm
1100 nm
900 nm
1200 nm
When a soap bubble is incident with sunlight, a colorful pattern is formed on the surface of the bubble. This phenomenon is caused by
reflection
interference
reflection & refraction
reflection & interference
White light is incident normally on a lens (n = 1.52) that is coated with a film of MgF2 (n = 1.38). What is the minimum thickness of the film if the yellow light of wavelength 550 nm (in air) is missing in the reflected light?
99.6 nm
180.9 nm
100 dm
160 nm
A beam of red light of wavelength 450 nm is emitted from a helium neon laser of power 0.6 mW. What is the energy of a photon of this light?
4.0 × 10-19 J
4.4 × 10-19 J
4.5 × 10-19 J
5.4 × 10-19 J
An electron and a proton are moving and have the same de Broglie wavelength. Which of the following quantities would be the same for the two particles?
force
intensity
velocity
momentum
Why can’t an optical microscope resolve smaller objects when compared with an electron microscope?
Light moves faster than electrons.
There is chromatic aberration for light.
Light experiences diffraction while electrons do not experience at all.
Light is of a longer wavelength when compared to the electron.
Calculate binding energy per nucleon for Deutrium
3.233 MeV per nucleon
6.466 MeV per nucleon
32.33 MeV per nucleon
64.66 MeV per nucleon
Calculate the reaction energy
-3.34 MeV
-3.11 MeV
-3.41 MeV
-3.39 MeV
Beta particle have the following properties, EXCEPT
It is basically an electron.
It has mass of an electron.
It is not deflected by any magnetic field.
It can be electrically positive (positron) or negative (electron
When a nucleus has too large neutron to proton ratio (N/Z), which of the following process will likely occur?
Alpha decay
Gamma decay
Beta positive decay
Beta negative decay
