0% Physics - NAT(National Aptitude Test)Physics refers to the physics subject on the National Aptitude Test (NAT), a standardised test in Pakistan. 1 / 100Which of the following electromagnetic waves has the shortest wavelength? X-rays Radio waves Microwaves Infrared 2 / 100The mass of an object is a measure of its: Density Volume Weight Inertia 3 / 100A 100 W bulb operates for 10 hours. The electrical energy consumed is: 10 kWh 1 kWh 100 kWh 0.1 kWh 4 / 100A wave has a frequency of 50 Hz and a wavelength of 2 m. Its speed is: 50 m/s 200 m/s 100 m/s 25 m/s 5 / 100The unit of magnetic flux is: Gauss Henry Tesla Weber 6 / 100A body of mass 5 kg is moving with a velocity of 10 m/s. Its momentum is: 0.5 kg·m/s 50 kg·m/s 2 kg·m/s 15 kg·m/s 7 / 100In a moving coil galvanometer, the deflection θ is proportional to: √I I I² 1/I 8 / 100The angle of projection for maximum range of a projectile is: 90° 30° 60° 45° 9 / 100When a wave passes from one medium to another, which property remains unchanged? Frequency Wavelength Amplitude Speed 10 / 100A particle executes SHM with amplitude A. Its speed is half the maximum speed when its displacement from the mean position is: A/√2 A/4 (√3/2)A A/2 11 / 100The splitting of white light into its constituent colors is called: Reflection Dispersion Diffraction Refraction 12 / 100A wire of resistance 10 Ω is stretched to double its length. Its new resistance is: 30 Ω 20 Ω 10 Ω 40 Ω 13 / 100A force of 10 N is applied to an object, causing it to move 5 meters in the direction of the force. The work done is: 15 J 0.5 J 2 J 50 J 14 / 100According to Ohm's Law: R = VI I = VR V = I/R V = IR 15 / 100 A car accelerates uniformly from rest to a velocity of 20 m/s in 5 seconds. The distance covered in the third second is: 8 m 4 m 10 m 6 m 16 / 100A capacitor of 4 μF is charged to 100 V. The energy stored in it is: 0.02 J 0.16 J 0.08 J 0.04 J 17 / 100The specific heat capacity of water in J/kg·K is approximately: 41800 418 4180 4.18 18 / 100Ohm's Law states the relationship between: Charge, current, and time Power, current, and voltage Voltage, current, and resistance Energy, power, and time 19 / 100A body is projected vertically upward with a velocity equal to half the escape velocity from Earth's surface. The maximum height it reaches is: (R = Earth's radius) R/3 R/2 R/4 R/5 20 / 100The lens which is thicker in the middle than at the edges is a: Concave lens Cylindrical lens Convex lens Plano-concave lens 21 / 100The mirror used by dentists to see an enlarged image of teeth is: Plane mirror Convex mirror Concave mirror Cylindrical mirror 22 / 100In a hydrogen atom, the electron transitions from n=3 to n=1. The emitted photon's energy is: 10.2 eV 1.89 eV 12.1 eV 13.6 eV 23 / 100A particle executes SHM with amplitude A. Its speed is half the maximum speed when its displacement is: A/4 (√3/2)A A/2 A/√2 24 / 100The unit of frequency is: Meter Decibel Second Hertz 25 / 100A force of 10 N is applied to an object and displaces it by 5 m in the direction of the force. The work done is: 2 J 50 J 0.5 J 15 J 26 / 100According to Newton's First Law of Motion, a body in rest will remain in rest unless acted upon by: A gravitational force An internal force An unbalanced external force A balanced force 27 / 100A proton and an electron are accelerated through the same potential difference. The ratio of their de Broglie wavelengths (λ_p/λ_e) is: 1 √(m_e/m_p) m_p/m_e √(m_p/m_e) 28 / 100A fluid is flowing through a pipe of varying cross-section. If the area is halved, the speed of flow becomes:A fluid is flowing through a pipe of varying cross-section. If the area is halved, the speed of flow becomes: Four times Double One-fourth Half 29 / 100Which of the following is a scalar quantity? Velocity Force Acceleration Speed 30 / 100The SI unit of force is: Watt Pascal Newton Joule 31 / 100The power of a lens is +2 D. Its focal length is: 0.25 m 1.0 m 0.5 m 2.0 m 32 / 100A convex lens is: Also known as a diverging lens Of uniform thickness throughout Thicker at the center than at the edges Thicker at the edges than at the center 33 / 100 In a parallel circuit, which of the following remains the same across all components? Voltage Resistance Current Power 34 / 100The de Broglie wavelength associated with an electron accelerated through 100 V is approximately: 0.123 Å 1.23 Å 123 Å 12.3 Å 35 / 100 A ball is thrown vertically upwards with a velocity of 20 m/s. The maximum height it will reach is (g = 10 m/s²): 10 m 30 m 20 m 40 m 36 / 100The energy of a photon is given by E = hf, where 'h' is: Hubble's constant Planck's constant Boltzmann constant Universal constant 37 / 100 A transformer works on the principle of: Electrostatic induction Mutual induction Self-induction Electrical conduction 38 / 100The energy stored in a stretched spring is: Chemical energy Kinetic energy Potential energy Thermal energy 39 / 100The acceleration due to gravity on the surface of the Moon, compared to Earth, is approximately: The same Six times less Six times greater Ten times less 40 / 100 In a p-type semiconductor, the majority charge carriers are: Protons Holes Electrons Neutrons 41 / 100A wire of resistance 10 Ω is stretched to double its length. Its new resistance will be: 30 Ω 10 Ω 20 Ω 40 Ω 42 / 100The half-life of a radioactive element is 10 days. How long will it take for ¾ of the sample to decay? 20 days 25 days 10 days 15 days 43 / 100The critical angle for a material is 30°. Its refractive index is: 1.0 0.5 1.5 2.0 44 / 100The critical angle for a material is 30°. Its refractive index is: 1.0 1.5 0.5 2.0 45 / 100In a standing wave, the points of maximum amplitude are called: Troughs Crests Antinodes Nodes 46 / 100The process by which a liquid changes into a gas at its boiling point is called: Sublimation Condensation Evaporation Boiling 47 / 100A Carnot engine operates between temperatures of 400 K and 300 K. Its efficiency is: 50% 75% 100% 25% 48 / 100In a Young's double-slit experiment, if the distance between slits is increased, the fringe width: Decreases Becomes zero Remains the same Increases 49 / 100A satellite is in a circular orbit around the Earth. If its orbital radius is doubled, its orbital velocity will become: 1/√2 times 4 times 2 times √2 times 50 / 100The fundamental frequency of an open organ pipe is 300 Hz. The frequency of the first overtone is: 450 Hz 900 Hz 300 Hz 600 Hz 51 / 100The SI unit of electric charge is: Ampere Volt Coulomb Ohm 52 / 100 Which color of light has the longest wavelength? Red Blue Green Violet 53 / 100Which of the following is a scalar quantity? Speed Force Acceleration Velocity 54 / 100A 2 kg mass is attached to a spring of constant 200 N/m. The period of oscillation is: 0.8π s 0.1π s 0.4π s 0.2π s 55 / 100In a nuclear reactor, the function of a moderator is to: Absorb neutrons Reflect neutrons Accelerate neutrons Slow down neutrons 56 / 100The SI unit of force is: Pascal Watt Newton Joule 57 / 100The time period of a simple pendulum depends on: Its mass The amplitude of swing Its length The material of the bob 58 / 100A radioactive element decays such that its activity reduces to 1/16 of its initial value in 80 days. Its half-life is: 40 days 10 days 20 days 80 days 59 / 100In Young's double-slit experiment, if the distance between slits is doubled, the fringe width: Halves Remains the same Doubles Quadruples 60 / 100A body is in equilibrium when: It is moving with constant velocity All of the above The net force acting on it is zero It is at rest 61 / 100In a hydrogen atom, an electron jumps from the n=4 to n=1 level. The number of possible spectral lines emitted is: 4 6 3 5 62 / 100Two forces of 5 N and 12 N act at a right angle to each other. The magnitude of their resultant is: 17 N 60 N 7 N 13 N 63 / 100The unit of power is: Joule Newton Pascal Watt 64 / 100A 2 kg block slides down a 30° inclined plane with an acceleration of 2 m/s². The frictional force acting on it is: (g = 10 m/s²) 8 N 2 N 6 N 4 N 65 / 100The acceleration due to gravity on the surface of the Earth is approximately: 9.8 m/s² 1.6 m/s² 10 m/s² 15 m/s² 66 / 100The force experienced by a current-carrying conductor in a magnetic field is given by: F = IL/B F = I²LB F = ILB sinθ F = IB/L 67 / 100A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10 cm. The power of the combination is: -10 D +10 D +5 D -5 D 68 / 100A car travels 60 km in the first hour and 80 km in the second hour. What is its average speed for the entire journey? 140 km/h 80 km/h 60 km/h 70 km/h 69 / 100A car travels 60 km in the first hour and 80 km in the second hour. What is its average speed for the entire journey? 60 km/h 80 km/h 140 km/h 70 km/h 70 / 100A 100 W bulb operates for 10 hours. The energy consumed is: 0.1 kWh 10 kWh 100 kWh 1 kWh 71 / 100The splitting of white light into its constituent colors is called: Reflection Diffraction Dispersion Refraction 72 / 100The half-life of a radioactive element is 10 days. What fraction of the original sample remains after 30 days? 1/8 1/2 1/16 1/4 73 / 100The number of significant figures in 0.00580 is: 6 3 2 5 74 / 100In a convex mirror, the image formed is always: Virtual and erect Real and inverted Real and erect Virtual and inverted 75 / 100 A satellite is in a circular orbit around the Earth. If its orbital radius is doubled, its orbital velocity: Doubles Becomes √2 times Halves Becomes 1/√2 times 76 / 100A transformer works on the principle of: Both B and C Mutual induction Electromagnetic induction Self-induction 77 / 100In a Millikan's oil drop experiment, an oil drop of mass 3.2 × 10⁻¹³ kg is held stationary between two plates 1 cm apart with a potential difference of 1000 V. The charge on the drop is (g = 10 m/s²): 1.6 × 10⁻¹⁹ C 3.2 × 10⁻¹⁹ C 4.8 × 10⁻¹⁹ C 6.4 × 10⁻¹⁹ C 78 / 100 A uniform rod of length L and mass M is pivoted at one end. Its moment of inertia about the pivot is: ML² ML²/12 2ML²/3 ML²/3 79 / 100According to Newton's second law of motion: F = m/a F = mv F = ma F = mgh 80 / 100The SI unit of electric current is: Volt Coulomb Ampere Ohm 81 / 100The rate of change of displacement is called: Speed Acceleration Velocity Momentum 82 / 100The momentum of an object is defined as the product of its: Weight and velocity Force and time Mass and velocity Mass and acceleration 83 / 100The phenomenon by which a compass needle aligns itself in a north-south direction is due to: Earth's gravitational field Earth's electric field Earth's magnetic field Earth's atmospheric pressure 84 / 100A particle of mass m is moving in a circle of radius r with constant speed v. The work done by the centripetal force during one complete revolution is: πmv² 2πmv² Zero mv²/r 85 / 100A body is projected with a kinetic energy K. At the highest point of its trajectory, its kinetic energy is 3K/4. The angle of projection is: 45° 30° 60° 90° 86 / 100The first law of thermodynamics is essentially a statement of the conservation of: Charge Energy Mass Momentum 87 / 100The wavelength of the Kα X-ray line for an element with atomic number Z is proportional to: Z Z² 1/Z 1/Z² 88 / 100The specific heat capacity of water is: 100 J/g°C 4.18 J/g°C 10 J/g°C 1 J/g°C 89 / 100 A monoatomic gas is compressed adiabatically. The ratio of its final pressure to initial pressure is 8. The ratio of its final volume to initial volume is: 1/2 1/8 1/16 1/4 90 / 100 A beam of light passes from air into water. Which of the following does NOT change? Wavelength Speed Direction Frequency 91 / 100Two capacitors of 3 μF and 6 μF are connected in series with a 12 V battery. The charge on the 3 μF capacitor is: 12 μC 36 μC 24 μC 72 μC 92 / 100 In a nuclear reactor, the control rods are made of: Plutonium Graphite Uranium Cadmium or Boron 93 / 100The rate of change of displacement is called: Acceleration Velocity Speed Momentum 94 / 100A projectile is launched at an angle of 30° to the horizontal with a velocity of 40 m/s. What is its time of flight? (g = 10 m/s²) 6 s 2 s 4 s 8 s 95 / 100In a photoelectric experiment, the stopping potential is 2 V. The maximum kinetic energy of emitted electrons is: 2 eV 2 J 1 eV 0.5 eV 96 / 100The kinetic energy of a body of mass 2 kg moving at 10 m/s is: 200 J 100 J 20 J 50 J 97 / 100Three resistors of 2 Ω, 3 Ω, and 6 Ω are connected in parallel. Their equivalent resistance is: 0.5 Ω 11 Ω 1.5 Ω 1 Ω 98 / 100A body of mass 5 kg is moving with a velocity of 10 m/s. A force is applied for 2 seconds, after which its velocity becomes 20 m/s. The magnitude of the applied force is: 50 N 75 N 100 N 25 N 99 / 100The first law of thermodynamics is essentially a statement of the conservation of: Momentum Mass Energy Charge 100 / 100Two charges of +4 μC and -4 μC are placed 2 cm apart. The dipole moment of this system is: 2 × 10⁻⁸ C·m 8 × 10⁻⁸ C·m 4 × 10⁻⁸ C·m 1 × 10⁻⁸ C·m Your score isThe average score is 52% 0% Restart quiz