1st Year Physics Full Book Paper

Q1. Multiple choice questions (Attempt all · 80 × 0.5 = 40)

1. The equation of continuity is based on the law of:
   1. Conservation of momentum
   2. Conservation of mass
   3. Conservation of energy
   4. Conservation of velocity
2. Dimension of universal gravitational constant is.
   1. [M⁻²L³T⁻²]
   2. [M³L⁻¹T⁻²]
   3. [M⁻¹L³T⁻²]
   4. [M⁻³L³T⁻²]
3. Work done from force-extension graph is equal to
   1. slope of graph
   2. perimeter of graph
   3. area under graph
   4. maximum height
4. Vector product of two parallel vectors is:
   1. AB
   2. AB sin 90°
   3. Zero
   4. Undefined
5. The magnetic field around a long straight current-carrying conductor is in the form of:
   1. Straight lines
   2. Concentric circles
   3. Parabolic curves
   4. Random loops
6. Which particle gives mass to matter according to Higgs?
   1. Photon
   2. Gluon
   3. Higgs boson
   4. Z-boson
7. The odd force from the following is
   1. gravitational force
   2. elastic force
   3. frictional force
   4. electric force
8. If size (length) of the wings of a fan is increased, its rotational speed, for the same voltage and current, will
   1. increase
   2. decrease
   3. may increase or decrease
   4. remain constant
9. What is the force experienced by a projectile after the initial force that launched it into the air in the absence of air resistance?
   1. The gravitational force
   2. The nuclear force
   3. The contact force
   4. The electromagnetic force
10. The first postulate of special relativity states that the laws of physics are same in:
    1. All accelerating frames
    2. All inertial frames
    3. All rotating frames
    4. All gravitational fields
11. Ideal gas molecules exert force on each other only during:
    1. Free expansion
    2. Collision
    3. Heating
    4. Cooling
12. Electric field is related to potential gradient by:
    1. E = qΔV
    2. E = Δr/ΔV
    3. E = -ΔV/Δr
    4. E = V/r
13. In Doppler's effect formula, vs represents:
    1. Speed of listener
    2. Speed of sound
    3. Speed of source
    4. Speed of medium
14. Drift velocity is produced when
    1. No electric field exists
    2. A potential difference is applied
    3. Temperature decreases
    4. Conductor is cooled
15. In streamline flow, the velocity of particles at a point is:
    1. Always different
    2. Zero
    3. Same
    4. Infinite
16. The diameter of the Earth is approximately:
    1. 10⁹ m
    2. 10⁷ m
    3. 10¹² m
    4. 10⁴ m
17. Polycrystalline solids consist of
    1. one large crystal
    2. many small crystals with random orientation
    3. fluid layers
    4. only amorphous particles
18. A physical quantity that has both magnitude and direction is called:
    1. Scalar
    2. Vector
    3. Constant
    4. Unit quantity
19. The combined electric and magnetic force acting on a charged particle is called:
    1. Fleming force
    2. Coulomb force
    3. Lorentz force
    4. Maxwell force
20. The Higgs field gives mass to
    1. all elementary particles
    2. only photons
    3. only electrons
    4. only quarks
21. Negative work occurs when:
    1. Force is perpendicular to displacement
    2. Force is in same direction as displacement
    3. Force is opposite to displacement
    4. Force is zero
22. Angular momentum for a rigid body is:
    1. L = Iω
    2. L = Iα
    3. L = mω
    4. L = mv²
23. A body starting from rest means:
    1. vᵢ = 0
    2. v𝒻 = 0
    3. a = 0
    4. t = 0
24. A frame of reference that is at rest or moving with uniform velocity is called a:
    1. stationary frame
    2. inertial frame
    3. non-inertial frame
    4. rotational frame
25. Maximum work is obtained by the process called:
    1. Isochoric
    2. Isothermal
    3. Isobaric
    4. Adiabatic
26. If two points are at same potential, are there any electric field lines connecting them?
    1. Yes
    2. No
    3. May or may not
    4. Insufficient information.
27. High frequency sound waves bounce off blood and are used in:
    1. MRI
    2. Echocardiography
    3. X-ray
    4. ECG
28. Kirchhoff's Current Law states that:
    1. Sum of voltages in a circuit is zero
    2. Voltage is constant
    3. Current is same everywhere
    4. Sum of currents entering a junction equals sum leaving
29. If density remains constant for steady flow, then ρ₁ = ρ₂ and continuity becomes:
    1. A₁ + v₁ = A₂ + v₂
    2. A₁/A₂ = v₁/v₂
    3. A₁v₁ = A₂v₂
    4. A₁v₁² = A₂v₂²
30. Which of the following is a dimensional variable?
    1. Angle
    2. Strain
    3. Length
    4. Coefficient of friction
31. Crystalline solids have
    1. sharp melting point
    2. broad melting range
    3. no melting point
    4. variable melting behaviour
32. Scalar product of antiparallel vectors is:
    1. Negative
    2. Positive
    3. Zero
    4. Undefined
33. When the angle between velocity and magnetic field is neither 0°, 90°, nor 180°, the particle moves in a:
    1. Circular path
    2. Straight path
    3. Helical path
    4. Zig-zag path
34. Which force binds quarks inside hadrons?
    1. Electromagnetic force
    2. Gravitational force
    3. Weak nuclear force
    4. Strong nuclear force
35. SI unit of work is:
    1. Watt
    2. Joule
    3. Newton
    4. Pascal
36. The term mr² represents:
    1. Torque
    2. Angular momentum
    3. Moment of inertia
    4. Linear inertia
37. The horizontal velocity of a projectile is:
    1. Constant
    2. Increasing
    3. Decreasing
    4. Zero
38. Minkowski space combines:
    1. Time with three spatial dimensions
    2. Time with mass
    3. Time with energy
    4. Length with velocity
39. The average kinetic energy of gas molecules depends on temperature only.
    1. Pressure
    2. Volume
    3. Density
    4. Temperature
40. Inside a Faraday cage, the electric field is:
    1. Maximum
    2. Zero
    3. Variable
    4. Constant
41. Formula of intensity in terms of power is:
    1. I = PA
    2. I = P/A
    3. I = A/P
    4. I = Pt/A
42. In the potentiometer equation E2 = (l2/l1) E1, the quantities l1 and l2 represent
    1. Current
    2. Resistances
    3. Balancing lengths
    4. Time intervals
43. The Venturi meter works on which principle?
    1. Conservation of mass
    2. Bernoulli's principle
    3. Archimedes' principle
    4. Pascal's law
44. The mean diameter of a wire is found to be (0.50±0.02) mm. The percentage uncertainty in the diameter is.
    1. 0.02
    2. 0.04
    3. 0.06
    4. 0.08
45. Body-centred cubic (BCC) unit cell contains atoms at
    1. only corners
    2. only centre
    3. corners and centre
    4. face centres
46. The cross product of two vectors A and B is equal to:
    1. AB cos θ
    2. AB sin θ n̂
    3. A/B
    4. 0 always
47. Which of the following particle in motion cannot be deflected by magnetic field?
    1. Electron
    2. Proton
    3. Alpha-particle
    4. Neutron
48. Which particle is exchanged between quarks?
    1. Photon
    2. Gluon
    3. Electron
    4. Neutrino
49. Which of the following is a conservative field?
    1. Frictional field
    2. Gravitational field
    3. Viscous field
    4. Air resistance field
50. 1 radian is equal to:
    1. 90°
    2. 180°
    3. 57.3°
    4. 360°
51. During an explosion, the total momentum before explosion is:
    1. Maximum
    2. Equal to final
    3. Zero
    4. Cannot be determined
52. Value of speed of light (c) is approximately:
    1. 3×10² m/s
    2. 3×10⁵ m/s
    3. 3×10⁸ m/s
    4. 3×10¹⁰ m/s
53. Charles's law graph between volume and temperature is
    1. Curved
    2. Parabolic
    3. Straight line
    4. Zig-zag
54. A charge +q placed in an electric field experiences a force:
    1. Opposite to E
    2. Along the direction of E
    3. Perpendicular to E
    4. Zero
55. Which type of light is reduced to half after passing through one Polaroid?
    1. Laser light
    2. UV light
    3. Infrared light
    4. Unpolarized light
56. A potentiometer works on the principle of
    1. Heating effect
    2. Null method
    3. Resonance
    4. Magnetic induction
57. In a paratrooper's jump, the parachute slows him down because:
    1. Weight increases
    2. Drag force increases
    3. Gravity decreases
    4. Air becomes denser
58. Dimensional analysis cannot be used to derive formulas involving:
    1. Logarithms
    2. Velocity
    3. Acceleration
    4. Force
59. Crystalline solids have particles arranged in a
    1. random pattern
    2. fluid-like arrangement
    3. irregular arrangement
    4. regular
60. If a vector A makes angle θ with the horizontal, its x-component Ax is:
    1. A sin θ
    2. A tan θ
    3. A cos θ
    4. A/ sin θ
61. A charged particle moves in a circular path when:
    1. v ⟂ B
    2. v ∥ B
    3. v ∝ B
    4. v = 0
62. According to string theory, forces like electromagnetism arise from
    1. quarks
    2. vibrations of strings
    3. molecules
    4. photons only
63. Work done around a closed path in a conservative field is:
    1. Positive
    2. Negative
    3. Zero
    4. Infinite
64. On a frictionless banked road, centripetal force is provided by:
    1. Friction
    2. Weight
    3. Normal force
    4. Air resistance
65. A light object hitting a heavy object at rest usually:
    1. Stops moving
    2. Rebounds with the same speed
    3. Moves faster
    4. Breaks apart
66. An inertial frame of reference is the one.
    1. Which is at rest.
    2. Which is moving with a uniform velocity along a straight line.
    3. Which has zero acceleration.
    4. All of these
67. The equation PV = NkT relates pressure, volume, and temperature with:
    1. Boltzmann constant
    2. Avogadro's number
    3. Molar mass
    4. Molecular size
68. The region between opposite charges where field is strong is due to:
    1. Low density of lines
    2. No field
    3. Circular lines
    4. High density of lines
69. Which law gives intensity of transmitted polarized light?
    1. Snell's law
    2. Malus's law
    3. Newton's law
    4. Bernoulli's law
70. Which one of the following electrical devices helps us to measure the accurate value of emf?
    1. meter Bridge
    2. voltmeter
    3. multimeter
    4. potentiometer
71. Which assumption belongs to an ideal fluid?
    1. Flow is turbulent
    2. Flow is rotational
    3. Internal friction exists
    4. Flow is laminar
72. The difference between true value and observed value is called:
    1. Uncertainty
    2. Precision
    3. Error
    4. Accuracy
73. Elastic modulus is defined as:
    1. Stress × strain
    2. Stress ÷ strain
    3. Strain ÷ stress
    4. Force ÷ area
74. The y-component of a vector making angle θ is:
    1. A sin θ
    2. A cos θ
    3. A tan θ
    4. A cot θ
75. The formula for magnetic force on a conductor in a magnetic field is:
    1. F = IBL
    2. F = BIL sinθ
    3. F = BI/L
    4. F = L/B
76. Particles made of quark-antiquark pairs are called:
    1. Baryons
    2. Mesons
    3. Leptons
    4. Bosons
77. Work is positive when the angle between force and displacement is:
    1. 0° to 90°
    2. 90° to 180°
    3. 180° to 270°
    4. 270° to 360°
78. Centripetal acceleration direction is always:
    1. Tangential to the circle
    2. Away from center
    3. Toward the center
    4. Downward
79. Two equal masses colliding elastically exchange:
    1. Directions only
    2. Velocities
    3. Accelerations
    4. Energies
80. Length of a moving object becomes:
    1. Larger
    2. Shorter
    3. Stays the same
    4. Infinite