Here are the Questions (MCQs) with Answers and Explanations:
- Which of the following quantities remains constant for an object moving in a circular path at a constant speed?
- A) Velocity
- B) Speed
- C) Acceleration
- D) Angular momentum
- Answer: B) Speed
- Explanation: In uniform circular motion, the speed of the object remains constant because it covers equal distances in equal time intervals. Velocity, on the other hand, changes as it has both magnitude and direction.
- What happens to the resistance of a metallic wire when its length is doubled while keeping its cross-sectional area constant?
- A) It becomes half
- B) It doubles
- C) It remains the same
- D) It depends on the material of the wire
- Answer: C) It remains the same
- Explanation: The resistance of a wire depends on its length, cross-sectional area, and resistivity. When length is doubled while keeping the cross-sectional area constant, the resistance remains the same.
- Which of the following phenomena explains why a mirage appears on a hot summer day?
- A) Refraction
- B) Reflection
- C) Dispersion
- D) Diffraction
- Answer: A) Refraction
- Explanation: A mirage is caused by the refraction of light as it passes through layers of air with different temperatures, creating an optical illusion.
- When an object is placed at the focus of a concave mirror, what type of image is formed?
- A) Real and inverted
- B) Real and upright
- C) Virtual and inverted
- D) Virtual and upright
- Answer: D) Virtual and upright
- Explanation: In a concave mirror, when an object is placed at its focus, a virtual and upright image is formed.
- What is the SI unit of capacitance?
- A) Ohm
- B) Farad
- C) Volt
- D) Ampere
- Answer: B) Farad
- Explanation: The SI unit of capacitance is the farad (F).
- Which of the following is not a vector quantity?
- A) Force
- B) Velocity
- C) Mass
- D) Acceleration
- Answer: C) Mass
- Explanation: Mass is a scalar quantity because it has magnitude but no direction, unlike vectors.
- What is the SI unit of electric charge?
- A) Volt
- B) Ampere
- C) Coulomb
- D) Watt
- Answer: C) Coulomb
- Explanation: The SI unit of electric charge is the coulomb (C).
- A car accelerates uniformly from rest to a speed of 30 m/s in 6 seconds. What is its acceleration?
- A) 5 m/s²
- B) 3 m/s²
- C) 10 m/s²
- D) 2 m/s²
- Answer: A) 5 m/s²
- Explanation:
- Acceleration is calculated using the formula: a=v-u/t, where v is the final velocity, u is the initial velocity, and t is the time. In this case, v=30m/s, u=0m/s, and t=6s, so a=30m/s-0m/s/6s= 5m/s2.
- Which part of the electromagnetic spectrum has the shortest wavelength?
- A) Infrared
- B) X-rays
- C) Microwaves
- D) Radio waves
- Answer: B) X-rays
- Explanation: X-rays have shorter wavelengths compared to other parts of the electromagnetic spectrum listed.
- What is the law of conservation of energy?
- A) Energy cannot be created or destroyed; it can only change forms.
- B) Energy is created and destroyed continuously.
- C) Energy can only be conserved in mechanical systems.
- D) Energy is always lost as heat.
- Answer: A) Energy cannot be created or destroyed; it can only change forms.
- Explanation: The law of conservation of energy states that the total energy of an isolated system remains constant; it is neither created nor destroyed but can change from one form to another.
- A convex lens always forms which type of image?
- A) Real and inverted
- B) Virtual and upright
- C) Real and upright
- D) Virtual and inverted
- Answer: D) Virtual and inverted
- Explanation: A convex lens forms a virtual and inverted image when the object is beyond its focal point.
- Which of the following statements is true about the law of reflection?
- A) The angle of incidence is equal to the angle of refraction.
- B) The angle of incidence is equal to the angle of reflection.
- C) The angle of refraction is greater than the angle of incidence.
- D) The angle of reflection is greater than the angle of incidence.
- Answer: B) The angle of incidence is equal to the angle of reflection.
- Explanation: The law of reflection states that the angle of incidence is equal to the angle of reflection.
- When a current-carrying wire is placed in a magnetic field, what force acts on it?
- A) Gravitational force
- B) Electrostatic force
- C) Magnetic force
- D) Tension force
- Answer: C) Magnetic force
- Explanation: A current-carrying wire in a magnetic field experiences a magnetic force, known as the Lorentz force.
- The nucleus of an atom is positively charged. What is its charge?
- A) +1
- B) +2
- C) +3
- D) It varies for different elements
- Answer: D) It varies for different elements
- Explanation: The charge of the nucleus varies depending on the number of protons it contains, which is unique for each element.
- Which of the following is a non-renewable source of energy?
- A) Solar energy
- B) Wind energy
- C) Coal
- D) Hydroelectric energy
- Answer: C) Coal
- Explanation: Coal is a non-renewable source of energy as it is finite and depletes over time.
- Which of the following is an example of a first-class lever?
- A) Wheelbarrow
- B) Tweezers
- C) Bottle opener
- D) Scissors
- Answer: C) Bottle opener
- Explanation: In a first-class lever, the fulcrum is located between the effort and the load. A bottle opener is an example of a first-class lever.
- What is the SI unit of power?
- A) Joule
- B) Watt
- C) Newton
- D) Volt
- Answer: B) Watt
- Explanation: The SI unit of power is the watt (W).
- Which of the following statements is true regarding the behavior of gases?
- A) Gases have a definite shape and volume.
- B) Gases are highly compressible.
- C) Gases do not exert pressure.
- D) Gases have high densities.
- Answer: B) Gases are highly compressible.
- Explanation: Gases are highly compressible because their particles are widely spaced and can be compressed closer together.
- What is the principle behind a transformer’s operation?
- A) Mechanical rotation
- B) Magnetic induction
- C) Thermal conduction
- D) Electrostatic attraction
- Answer: B) Magnetic induction
- Explanation: Transformers operate based on the principle of magnetic induction, where changing magnetic fields induce a voltage in a coil.
- When a wave passes from a denser medium to a rarer medium, what happens to its speed?
- A) It decreases
- B) It remains the same
- C) It increases
- D) It depends on the wavelength
- Answer: C) It increases
- Explanation: When a wave passes from a denser medium to a rarer medium, its speed increases.
- Which of the following statements is true about a concave mirror?
- A) It always forms a virtual and erect image.
- B) It forms a real and inverted image when the object is beyond its focus.
- C) It forms a virtual and upright image for all positions of the object.
- D) It forms a real and inverted image for all positions of the object.
- Answer: B) It forms a real and inverted image when the object is beyond its focus.
- Explanation: A concave mirror can form both real and inverted images when the object is placed beyond its focal point.
- What is the SI unit of resistance?
- A) Ohm
- B) Farad C)
- Henry
- D) Volt
- Answer: A) Ohm
- Explanation: The SI unit of resistance is the ohm (Ω).
- Which law states that the total electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of free space?
- A) Coulomb’s law
- B) Gauss’s law
- C) Ampere’s law
- D) Ohm’s law
- Answer: B) Gauss’s law
- Explanation: Gauss’s law relates the electric flux through a closed surface to the charge enclosed by that surface.
- What is the process by which an unstable nucleus emits radiation to become more stable?
- A) Fusion
- B) Fission
- C) Radioactivity
- D) Diffraction
- Answer: C) Radioactivity
- Explanation 19: Radioactivity is the process by which an unstable nucleus emits radiation to achieve a more stable configuration.
- What is the fundamental force responsible for holding the nucleus of an atom together?
- A) Gravitational force
- B) Electromagnetic force
- C) Strong nuclear force
- D) Weak nuclear force
- Answer: C) Strong nuclear force
- Explanation: The strong nuclear force is the fundamental force that holds the nucleus of an atom together, overcoming the electrostatic repulsion between protons.
- In a Young’s double-slit experiment, if the distance between the slits is reduced, what happens to the interference fringes on the screen?
- A) They become wider.
- B) They become narrower.
- C) They disappear.
- D) They remain unchanged.
- Answer: B) They become narrower.
- Explanation: When the distance between the slits is reduced, the fringe separation (distance between bright or dark fringes) increases, making them narrower.
- A wire of resistance R is stretched to double its length. What will be the new resistance?
- A) R/2
- B) R
- C) 2R
- D) 4R
- Answer: C) 2R
- Explanation: When a wire is stretched to double its length, its resistance becomes four times the original value, so the new resistance is 2R.
- Which of the following phenomena explains the change in the pitch of a sound when an ambulance siren approaches and then recedes from an observer?
- A) Doppler effect
- B) Reflection
- C) Refraction
- D) Dispersion
- Answer: A) Doppler effect
- Explanation: The change in the pitch of sound due to the motion of the source or observer is explained by the Doppler effect.
- A particle of mass m is moving in a circular path with a constant speed v. What is the magnitude of the net force acting on the particle?
- A) Zero
- B) mv
- C) m/v
- D) m^2v^2/r, where r is the radius of the circle
- Answer: A) Zero
- Explanation: In uniform circular motion, the net force acting on the particle is zero because the centripetal force and the centrifugal force (inertia) balance each other.
- What is the quantum number that specifies the orientation of an orbital in space?
- A) Principal quantum number (n)
- B) Angular momentum quantum number (l)
- C) Magnetic quantum number (m)
- D) Spin quantum number (s)
- Answer: C) Magnetic quantum number (m)
- Explanation: The magnetic quantum number (m) specifies the orientation of an orbital in space within a given energy level.
- A particle of mass m is initially at rest. It is subjected to a net force F, which acts on it for a time interval t. If the particle covers a distance d during this time, what is the work done by the force F on the particle?
- A) Ft
- B) 0
- C) Fd
- D) (1/2)Fdt
- Answer: C) Fd
- Explanation: The work done by a force is given by the product of the force and the distance moved in the direction of the force. In this case, it is Fd.
- In a p-n junction diode, which region has excess electrons?
- A) P-region
- B) N-region
- C) Depletion region
- D) None of the above
- Answer: B) N-region
- Explanation: In a p-n junction diode, the N-region has an excess of electrons, making it negatively charged.
- Question 28: What is the frequency of a photon whose energy is twice the rest energy of an electron?
- A) 22ℎf=2hmc2
- B) 2ℎf=h2mc2
- C) 2f=mc2h
- D) 2f=mc22h
- Answer: D) 2f=mc22h
- Explanation: The energy of a photon is given by E=hf, where ℎh is Planck’s constant. Given that the energy is twice the rest energy of an electron (22mc2), you can rearrange the formula to find the frequency (2f=mc22h).
- Which of the following is not a fundamental force in nature?
- A) Gravitational force
- B) Electromagnetic force
- C) Weak nuclear force
- D) Kinetic force
- Answer: D) Kinetic force
- Explanation: Kinetic force is not a fundamental force in nature. It refers to the force associated with the motion of an object.
- Which of the following devices is used to measure electric current accurately?
- A) Voltmeter B) Ammeter
- C) Ohmmeter
- D) Multimeter
- Answer: B) Ammeter
- Explanation: An ammeter is specifically designed to measure electric current accurately in a circuit.
- Two capacitors of capacitance C1 and C2 are connected in parallel. What is the total capacitance of the combination?
- A) 2C1+C2
- B) 2C1+C2C1C2
- C) 2C1C2C1+C2
- D) 2C1−C2C1C2
- Answer: B) 2C1+C2C1C2
- Explanation: When capacitors are connected in parallel, the total capacitance is given by the reciprocal of the sum of the reciprocals of individual capacitances, which is 2C1+C2C1C2.
- Which phenomenon explains the apparent bending of light waves as they pass from one medium into another with different refractive indices?
- A) Reflection
- B) Dispersion
- C) Refraction
- D) Diffraction
- Answer: C) Refraction
- Explanation: Refraction is the phenomenon that explains the bending of light waves when they pass from one medium to another with different refractive indices.
- The half-life of a radioactive substance is 10 minutes. If you start with 40 grams of the substance, how many grams will remain after 30 minutes?
- A) 10 grams
- B) 20 grams
- C) 5 grams
- D) 2.5 grams
- Answer: C) 5 grams
- Explanation: After 30 minutes, three half-lives have passed (30 minutes / 10 minutes per half-life = 3 half-lives). Therefore, 12×12×12=1821×21×21=81 of the original substance remains, which is 5 grams.
- Which of the following phenomena is responsible for the formation of a rainbow?
- A) Reflection
- B) Refraction
- C) Dispersion
- D) Diffraction
- Answer: C) Dispersion
- Explanation: A rainbow is formed due to the dispersion of sunlight into its constituent colors when it passes through water droplets in the atmosphere.
- What is the primary source of energy in stars like the Sun?
- A) Nuclear fusion
- B) Nuclear fission
- C) Chemical reactions
- D) Gravitational contraction
- Answer: A) Nuclear fusion
- Explanation: The primary source of energy in stars like the Sun is nuclear fusion, where hydrogen nuclei combine to form helium, releasing vast amounts of energy.
- In a double-slit interference experiment with monochromatic light, if the separation between the slits is halved while keeping all other parameters the same, what happens to the interference pattern on the screen?
- A) The fringes become wider.
- B) The fringes become narrower.
- C) The fringe width remains unchanged.
- D) The fringes disappear.
- Answer: B) The fringes become narrower.
- Explanation: Halving the slit separation increases the fringe spacing, making the fringes narrower.
- What is the de Broglie wavelength of an electron with a velocity of 1.0×1061.0×106 m/s?
- A) 1.22×10−91.22×10−9 m
- B) 6.63×10−346.63×10−34 m
- C) 6.63×10−106.63×10−10 m
- D) 1.22×10−61.22×10−6 m
- Answer: C) 6.63×10−106.63×10−10 m
- Explanation: The de Broglie wavelength of a particle is given by λ=mvh, where ℎh is Planck’s constant, m is the mass of the particle, and v is its velocity.
- Which of the following statements is true about a convex lens?
- A) It always forms a virtual and erect image.
- B) It always forms a real and inverted image.
- C) It can form both real and virtual images, depending on the object’s position.
- D) It forms no image at all.
- Answer: C) It can form both real and virtual images, depending on the object’s position.
- Explanation: A convex lens can form both real and virtual images depending on whether the object is placed beyond or within its focal point.
- Which of the following quantities is conserved during elastic collisions between two objects?
- A) Kinetic energy
- B) Momentum
- C) Both kinetic energy and momentum
- D) Neither kinetic energy nor momentum
- Answer: B) Momentum
- Explanation: In elastic collisions, momentum is conserved, but kinetic energy may not be conserved due to changes in the internal energy of the objects.
- A particle is moving in a circular path with a constant speed. What happens to its acceleration as it moves closer to the center of the circle?
- A) It decreases.
- B) It increases.
- C) It remains constant.
- D) It depends on the mass of the particle.
- Answer: B) It increases.
- Explanation: As a particle moves closer to the center of the circle, its acceleration increases because the radius of curvature decreases.
- In a magnetic field, a charged particle moves in a helical path. Which of the following properties of the particle can be determined from this motion?
- A) Charge of the particle
- B) Mass of the particle
- C) Speed of the particle
- D) Spin of the particle
- Answer: A) Charge of the particle
- Explanation: The charge of the particle can be determined from its helical path in a magnetic field using the formula for the magnetic force on a charged particle.
- What happens to the resistance of a conductor when its temperature increases?
- A) Resistance increases
- B) Resistance decreases
- C) Resistance remains unchanged
- D) It depends on the type of conductor
- Answer: A) Resistance increases
- Explanation: In most conductors, resistance increases as temperature increases due to increased collisions between electrons and lattice ions.
- A concave mirror has a focal length of -10 cm. Where should an object be placed in front of the mirror to form a real and inverted image?
- A) 5 cm in front of the mirror
- B) 10 cm in front of the mirror
- C) 20 cm in front of the mirror
- D) 30 cm in front of the mirror
- Answer: B) 10 cm in front of the mirror
- Explanation: For a concave mirror with a negative focal length, an object placed at a distance equal to the focal length in front of the mirror will form a real and inverted image.
- Which of the following is not a fundamental particle of an atom?
- A) Proton
- B) Neutron
- C) Electron
- D) Positron
- Answer: D) Positron
- Explanation: A positron is not a fundamental particle of an atom; it is the antimatter counterpart of an electron.
- What is the maximum number of electrons that can occupy the 3n=3 energy level in an atom?
- A) 2
- B) 8
- C) 18
- D) 32
- Answer: C) 18
- Explanation: The maximum number of electrons in the 3n=3 energy level is 18, based on the formula 22n2.
Explore our collection of 50 NEET Physics MCQs with clear explanations, suitable for students of all levels. Whether you are preparing for NEET or looking to deepen your physics knowledge, these questions will help you excel in your studies.
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