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Hassan
1.For interference of light waves to take place, the required condition is
A. The path difference of the light waves from the two sources must be large
B. The interfering waves must be non-coherent
C. The light waves may come from different sources
D. The path difference of the light waves from the two sources must be large
2.The property of bending of light around an obstacle and spreading of light waves into geometric shadow of an obstacle is called:
A. Diffraction of Light
B. Polarization of Light
C. Quantization of Light
D. Diffraction of Light
3.The normal human eye can focus a sharp image of an object on the eye if the object is located at certain distance called
A. Least Point
B. Near Point
C. Far Point
D. Least Point
4.A source of sound wave emits waves of frequency ‘f’. If ‘v’ is speed of sound waves, then what will be the wavelength of the waves
A. v /f
B. vf
C. v - uo/ f
D. v /f
5.What is the period of mass spring system during SHM if the ratio of mass to spring constant is ¼?
A. π
B. 2π
C. 1/π
D. π
6.A wire is stretched by a force which causes an extension. The energy is stored in it only when:
A. The extension of wire is proportional to force applied
B. The cross-section area of the wire remains constant
C. The wire is not stretched beyond its elastic limit
D. The extension of wire is proportional to force applied
7.Which statement is correct:
A. Elasticity is that property of body which enables body to regain its original dimension
B. Elasticity is that property of a body that does not allow it to return to its original shape
C. Elasticity is that property of a body that allows it to retain its original shape and dimension after the stress is removed.
D. Elasticity is that property of body which enables body to regain its original dimension
8.For a gas of volume V in its equilibrium state, if the pressure does change with time then total kinetic energy of gas is constant because
A. Collisions between gas molecules occur
B. Collisions between gas molecules occur linearly
C. Collisions must be elastic
D. Collisions between gas molecules occur
9.Which of the following is the proper way to study the sinusoidal waveform of the voltage?
A. Voltage is connected to X input and the time base is switched off
B. Voltage is connected to Y input and the time base is switched on
C. Voltage is connected to Y input and the time base is switched off
D. Voltage is connected to X input and the time base is switched off
10.Electron gun in cathode ray oscilloscope contains
A. Filament, cathode, grid, anodes
B. Cathode, anode, capacitor, screen
C. Emitter, base, collector
D. Filament, cathode, grid, anodes
11.If 2 A current passes through a resistor when connected to a certain battery. If the resistance is replaced by the double resistance, then the current will become
A. 2 A
B. 4 A
C. 6 A
D. 2 A
12.In Helium-Neon laser, population inversion of _________ atoms is achieved which emit radiations, when they are stimulated to fall at lower level.
A. Neon
B. Helium
C. Helium and Neon
D. Neon
13.If the number of turns of a solenoid circular coil is doubled, but the current in the coil and radius of the coil remains same, then what will be the magnetic flux density produced by the coil?
A. Magnetic flux density will be halved
B. Magnetic flux density increases by different amount at different points
C. Magnetic flux density remains unchanged
D. Magnetic flux density will be halved
14.Wavelength of X-rays is the order of:
A. 10-6 m
B. 10-10 m
C. 10-13 m
D. 10-6 m
15.Laser beam can be used to generate three-dimensional image of object in a process called:
A. Computed technology
B. Computed tomography
C. Holography
D. Computed technology
16.Which of the following is true for Lasers?
A. Electrons are emitted
B. Stimulated emission of electrons is needed
C. Coherent monochromatic light is emitted
D. Electrons are emitted
17.What is meant by spontaneous emission of electrons in solids?
A. Electrons being emitted by the solids through photoelectric effect when irradiated with electromagnetic radiation
B. Incident electrons colliding with electrons in solids and releasing doubling the number of incident electrons
C. Electrons in solids are emitted without any external stimulus through radiation
D. Electrons being emitted by the solids through photoelectric effect when irradiated with electromagnetic radiation
18.When electrons lose all their kinetic energy in the first collision, the entire kinetic appears as an X-ray photon of energy:
A. K.E = eV
B. K.E = hλmin /c
C. K.E = hc /λmin
D. K.E = eV
19.The characteristic X-ray spectrum is due to:
A. The absorption of neutrons by target material
B. The bombardment of target material by protons
C. The bombardment of target material by electrons
D. The absorption of neutrons by target material
20.Ionizing capability of gamma rays is:
A. Equal to alpha and beta particle
B. Less than alpha but greater than beta particles
C. Less than both alpha and beta particles
D. Equal to alpha and beta particle
21.Half-life of a radioactive element is:
A. Inversely proportional to square of decay constant
B. Directly proportional to square of decay constant
C. Directly proportional to decay constant
D. Inversely proportional to square of decay constant
22.The transformation of a neutron into proton in the nucleus gives rise to emission of:
A. Beta particles
B. Alpha particles
C. Gamma particles
D. Beta particles
23.The ratio of the rate of decay of a parent atom to the number of radioactive nuclei present at that time is equal to:
A. Half-life of radioactive element
B. Mean life
C. Decay constant of radioactive element
D. Half-life of radioactive element
24.Which one of the following particle is emitted as a result of nuclear reaction?
A. Beta
B. Alpha
C. Gamma rays
D. Beta
25.When a lift is accelerated upward, the apparent weight of an object in it will be
A. Equal to its real weigh
B. Less than its real weight
C. Zero
D. Equal to its real weigh
26.Which of following is used to estimate the circulation of blood in a patient?
A. Carbon-14
B. Carbon-12
C. Phosphorus-32
D. Carbon-14
27.For the radiotherapy of a patient, it is required to double the absorbed dose in gray. What step must be taken?
A. Energy must be quadrated
B. Energy must be halved
C. Energy must be raised four times
D. Energy must be quadrated
28.The moment of inertial of a thin rod is
A. 1 /2 mL2
B. 1 /4 m3L
C. 1/12 mL
D. 1 /2 mL2
29.In mass spectrometer, detector or collector measures the:
A. Masses of isotopes
B. Percentages of isotopes
C. Relative abundances of isotopes
D. Masses of isotopes
30.A wheel of radius 1 m covers an angular displacement of 180. Its linear displacement is
A. 3.14 m
B. π rad
C. 6.28 m
D. 3.14 m
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