objective physics

1. What is the SI unit of momentum?

• A) \text{kg}\cdot\text{m/s}^2
• B) \text{kg}\cdot\text{m/s}
• C) \text{N}\cdot\text{s}^2
• D) \text{J}\cdot\text{s} Correct Answer: B) \text{kg}\cdot\text{m/s}

1. Which of the following quantities represents a measure of inertia?

• A) Velocity
• B) Acceleration
• C) Mass
• D) Force Correct Answer: C) Mass

1. What is the phenomenon responsible for the working of optical fibres?

• A) Refraction
• B) Interference
• C) Total internal reflection
• D) Diffraction Correct Answer: C) Total internal reflection

1. Who discovered radioactivity?

• A) Marie Curie
• B) Henri Becquerel
• C) Ernest Rutherford
• D) J.J. Thomson Correct Answer: B) Henri Becquerel

1. Sound waves are an example of which type of wave?

• A) Transverse waves
• B) Longitudinal waves
• C) Electromagnetic waves
• D) Matter waves Correct Answer: B) Longitudinal waves

1. What is the net work done on an object when the force applied is perpendicular to its displacement?

• A) Maximum
• B) Minimum
• C) Zero
• D) Negative Correct Answer: C) Zero

1. Which device is used to convert mechanical energy into electrical energy?

• A) Electric motor
• B) Transformer
• C) Generator
• D) Rectifier Correct Answer: C) Generator

1. What is the SI unit of magnetic flux?

• A) Tesla
• B) Weber
• C) Henry
• D) Gauss Correct Answer: B) Weber

1. In which medium does sound travel the fastest?

• A) Vacuum
• B) Air
• C) Water
• D) Steel Correct Answer: D) Steel

1. What does the first law of thermodynamics fundamentally conserve?

• A) Momentum
• B) Charge
• C) Energy
• D) Mass Correct Answer: C) Energy

1. What is the formula for centripetal acceleration of an object moving in a circle of radius r with speed v?

• A) v/r
• B) v^2/r
• C) v/r^2
• D) vr Correct Answer: B) v^2/r

1. Which of the following is an intrinsic semiconductor?

• A) Copper
• B) Silicon
• C) Glass
• D) Wood Correct Answer: B) Silicon

1. What is the standard value of atmospheric pressure at sea level?

• A) 1.013 \times 10^3 \text{ Pa}
• B) 1.013 \times 10^4 \text{ Pa}
• C) 1.013 \times 10^5 \text{ Pa}
• D) 1.013 \times 10^6 \text{ Pa} Correct Answer: C) 1.013 \times 10^5 \text{ Pa}

1. What type of image is formed by a concave lens for a real object?

• A) Real and inverted
• B) Virtual and erect
• C) Real and erect
• D) Virtual and inverted Correct Answer: B) Virtual and erect

1. What law governs the electrostatic force between two point charges?

• A) Ampere's law
• B) Faraday's law
• C) Coulomb's law
• D) Gauss's law Correct Answer: C) Coulomb's law

1. What is the SI unit of specific heat capacity?

• A) \text{J/kg}
• B) \text{J/}\text{K}
• C) \text{J}/(\text{kg}\cdot\text{K})
• D) \text{cal/g} Correct Answer: C) \text{J}/(\text{kg}\cdot\text{K})

1. Which color has the longest wavelength in the visible spectrum?

• A) Violet
• B) Green
• C) Yellow
• D) Red Correct Answer: D) Red

1. What is the particle predominantly responsible for triggering nuclear fission in Uranium-235?

• A) Proton
• B) Neutron
• C) Electron
• D) Alpha particle Correct Answer: B) Neutron

1. Which physical quantity is measured in hertz (Hz)?

• A) Amplitude
• B) Wavelength
• C) Frequency
• D) Time period Correct Answer: C) Frequency

1. What is the resistance of an ideal voltmeter?

• A) Zero
• B) Very small
• C) Moderate
• D) Infinite Correct Answer: D) Infinite

Physics objectives

Physics: One-Liner Questions and Answers

Light: Reflection and Refraction

1. What is the angle of reflection if a light ray strikes a plane mirror at an angle of 30^\circ to the surface?
   • Answer: 60^\circ (since the angle of incidence with the normal is 90^\circ - 30^\circ = 60^\circ).
2. Which spherical mirror always forms a virtual, erect, and diminished image for all positions of the object?
   • Answer: Convex mirror.
3. What is the focal length of a plane mirror?
   • Answer: Infinity.
4. State the relation between radius of curvature (R) and focal length (f) of a spherical mirror.
   • Answer: R = 2f (or f = R/2).
5. Why does a pencil immersed in water appear bent at the interface?
   • Answer: Due to the refraction of light as it passes from water to air.
6. What is the SI unit of power of a lens?
   • Answer: Dioptre (D).
7. Which lens has a negative power?
   • Answer: Concave lens.

The Human Eye and the Colorful World

1. Name the part of the human eye that controls the amount of light entering it.
   • Answer: Iris.
2. Which defect of vision can be corrected by using a concave lens?
   • Answer: Myopia (Short-sightedness).
3. What is the phenomenon responsible for the twinkling of stars?
   • Answer: Atmospheric refraction.
4. Why does the sky appear dark to astronauts in space?
   • Answer: Due to the absence of an atmosphere for scattering light.
5. Which color of white light deviates the most while passing through a glass prism?
   • Answer: Violet.

Electricity

1. What is the SI unit of electric current?
   • Answer: Ampere (A).
2. Name the device used to measure electric current in a circuit.
   • Answer: Ammeter (connected in series).
3. State Ohm's Law mathematically.
   • Answer: V = IR (Voltage = Current \times Resistance).
4. What happens to the total resistance when resistors are connected in series?
   • Answer: Total resistance increases (R_s = R_1 + R_2 + \dots).
5. What is the commercial unit of electrical energy?
   • Answer: Kilowatt-hour (\text{kWh} or 'unit').
6. Why are alloys commonly used in electrical heating devices like irons and toasters?
   • Answer: They have high resistivity and do not oxidize easily at high temperatures.

Magnetic Effects of Electric Current

1. What is the shape of magnetic field lines around a straight current-carrying conductor?
   • Answer: Concentric circles.
2. Which rule is used to find the direction of force experienced by a current-carrying conductor in a magnetic field?
   • Answer: Fleming's Left-Hand Rule.
3. What is the frequency of alternating current (AC) supplied in India?
   • Answer: 50\text{ Hz}.
4. Name the two safety measures commonly used in domestic electric circuits.
   • Answer: Electric fuse and earthing.
5. What is the function of a split-ring (commutator) in a DC motor?
   • Answer: To reverse the direction of current in the coil after every half rotation.

Sources of Energy

1. Which component of biogas is its primary combustible constituent?
   • Answer: Methane (CH_4).
2. What is the ultimate source of tidal energy?
   • Answer: Gravitational pull of the moon on the earth.

Objective physics only 5 minutes test.

1. SI unit of electric current is: A) Volt B) Ampere C) Ohm D) Watt Correct Answer: B) Ampere
2. The resistance of a conductor depends directly on: A) Area of cross-section B) Length of the conductor C) Density of the material D) Shape of the conductor Correct Answer: B) Length of the conductor
3. Focal length of a plane mirror is: A) Zero B) Positive C) Negative D) Infinity Correct Answer: D) Infinity
4. The device used to measure electric current in a circuit is: A) Voltmeter B) Galvanometer C) Ammeter D) Rheostat Correct Answer: C) Ammeter
5. The bending of light when it passes from one medium to another obliquely is called: A) Reflection B) Refraction C) Dispersion D) Scattering Correct Answer: B) Refraction
6. The power of a lens of focal length +2\text{ m} is: A) +0.5\text{ D} B) -0.5\text{ D} C) +2.0\text{ D} D) -2.0\text{ D} Correct Answer: A) +0.5\text{ D}
7. The part of the human eye that controls the amount of light entering is the: A) Retina B) Cornea C) Pupil D) Iris Correct Answer: C) Pupil
8. Joule's law of heating is given by the formula: A) H = VIt B) H = I^{2}Rt C) H = \frac{V^{2}}{R}t D) All of the above Correct Answer: D) All of the above
9. The magnetic field lines inside a long current-carrying straight solenoid are: A) Circular and close to each other B) Parallel straight lines C) Elliptical in shape D) Intersecting at the center Correct Answer: B) Parallel straight lines
10. A concave mirror gives a virtual, erect, and magnified image of an object when the object is placed: A) At infinity B) Between Pole and Focus C) At the Center of Curvature D) Beyond the Center of Curvature Correct Answer: B) Between Pole and Focus
11. The commercial unit of electrical energy is: A) Watt B) Kilowatt C) Kilowatt-hour D) Joule Correct Answer: C) Kilowatt-hour
12. The blue color of the clear sky is due to: A) Reflection of light B) Refraction of light C) Dispersion of light D) Scattering of light Correct Answer: D) Scattering of light
13. The resistance of a wire of length L and cross-sectional area A is R. If its length is doubled, its new resistance will be: A) R/2 B) R C) 2R D) 4R Correct Answer: C) 2R
14. The defect of vision in which a person can see distant objects clearly but cannot see nearby objects clearly is: A) Myopia B) Hypermetropia C) Presbyopia D) Astigmatism Correct Answer: B) Hypermetropia
15. Direction of magnetic field lines outside a bar magnet is always: A) From South pole to North pole B) From North pole to South pole C) Towards the center from all directions D) Random Correct Answer: B) From North pole to South pole
16. Which of the following represents Ohm's Law? A) V = IR B) I = VR C) R = VI D) V = I/R Correct Answer: A) V = IR
17. The splitting of white light into its component colors on passing through a glass prism is called: A) Reflection B) Refraction C) Dispersion D) Scattering Correct Answer: C) Dispersion
18. In a household circuit, appliances are always connected in: A) Series combination B) Parallel combination C) Mixed combination D) Direct short circuit Correct Answer: B) Parallel combination
19. The least distance of distinct vision for a normal human eye is about: A) 25\text{ cm} B) 25\text{ m} C) infinity D) 2.5\text{ cm} Correct Answer: A) 25\text{ cm}
20. The SI unit of electric power is: A) Joule B) Coulomb C) Watt D) Volt Correct Answer: C) Watt

Objective physics 5 minutes Test

1. What is the SI unit of electric current?

• A) Volt
• B) Ampere
• C) Ohm
• D) Watt Correct Answer: B) Ampere

1. Which of the following is a scalar quantity?

• A) Velocity
• B) Force
• C) Speed
• D) Acceleration Correct Answer: C) Speed

1. What is the acceleration due to gravity on the surface of the Earth approximately?

• A) 9.8 \text{ m/s}^2
• B) 8.9 \text{ m/s}^2
• C) 10.8 \text{ m/s}^2
• D) 9.0 \text{ m/s}^2 Correct Answer: A) 9.8 \text{ m/s}^2

1. Which law states that pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid?

• A) Archimedes' principle
• B) Pascal's law
• C) Bernoulli's principle
• D) Stokes' law Correct Answer: B) Pascal's law

1. What is the frequency of standard alternating current (AC) in India?

• A) 60 Hz
• B) 100 Hz
• C) 50 Hz
• D) 120 Hz Correct Answer: C) 50 Hz

1. Which phenomenon is responsible for the twinkling of stars?

• A) Reflection
• B) Total internal reflection
• C) Atmospheric refraction
• D) Dispersion Correct Answer: C) Atmospheric refraction

1. What is the energy possessed by a body due to its position or configuration called?

• A) Kinetic energy
• B) Potential energy
• C) Thermal energy
• D) Chemical energy Correct Answer: B) Potential energy

1. Who formulated the laws of motion?

• A) Albert Einstein
• B) Isaac Newton
• C) Galileo Galilei
• D) Johannes Kepler Correct Answer: B) Isaac Newton

1. What is the device used to measure electric current in a circuit?

• A) Voltmeter
• B) Galvanometer
• C) Ammeter
• D) Rheostat Correct Answer: C) Ammeter

1. Which type of mirror is commonly used as a rear-view mirror in vehicles?

• A) Plane mirror
• B) Concave mirror
• C) Convex mirror
• D) Cylindrical mirror Correct Answer: C) Convex mirror

1. What is the unit of work and energy in the SI system?

• A) Watt
• B) Joule
• C) Pascal
• D) Newton Correct Answer: B) Joule

1. Which colour of light deviates the least when passing through a prism?

• A) Violet
• B) Green
• C) Blue
• D) Red Correct Answer: D) Red

1. What is the absolute zero temperature on the Kelvin scale?

• A) 0 K
• B) 273 K
• C) -273 K
• D) 100 K Correct Answer: A) 0 K

1. What type of lens is used to correct myopia (short-sightedness)?

• A) Convex lens
• B) Concave lens
• C) Cylindrical lens
• D) Bifocal lens Correct Answer: B) Concave lens

1. What is the dimensional formula for force?

• A) [MLT^{-2}]
• B) [ML^2T^{-2}]
• C) [MLT^{-1}]
• D) [ML^{-1}T^{-2}] Correct Answer: A) [MLT^{-2}]

1. Which wave requires a material medium for its propagation?

• A) Light waves
• B) Radio waves
• C) Sound waves
• D) X-rays Correct Answer: C) Sound waves

1. What is the rate of flow of electric charge called?

• A) Potential difference
• B) Electric resistance
• C) Electric current
• D) Power Correct Answer: C) Electric current

1. What is the escape velocity of an object from the Earth's surface approximately?

• A) 5.2 \text{ km/s}
• B) 11.2 \text{ km/s}
• C) 21.4 \text{ km/s}
• D) 3.1 \text{ km/s} Correct Answer: B) 11.2 \text{ km/s}

1. Which subatomic particle has a negative charge?

• A) Proton
• B) Neutron
• C) Electron
• D) Positron Correct Answer: C) Electron

1. What is the SI unit of power?

• A) Joule
• B) Newton
• C) Watt
• D) Coulomb Correct Answer: C) Watt

Physics objectives

Here are 20 objective Physics questions along with their answers, with a one-line gap between each question:

1. What is the SI unit of electric current? Answer: Ampere
2. Which physical quantity is measured in Hertz (Hz)? Answer: Frequency
3. What is the value of the acceleration due to gravity (g) on the surface of the Earth? Answer: 9.8 \text{ m/s}^2
4. Which law states that "pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid"? Answer: Pascal's Law
5. What type of mirror is commonly used as a rear-view mirror in vehicles? Answer: Convex mirror
6. What is the speed of light in a vacuum? Answer: 3 \times 10^8 \text{ m/s}
7. Which instrument is used to measure atmospheric pressure? Answer: Barometer
8. What is the phenomenon of splitting of white light into its seven constituent colors called? Answer: Dispersion of light
9. Which scientist formulated the three laws of motion? Answer: Sir Isaac Newton
10. What is the unit of electrical resistance? Answer: Ohm (\Omega)
11. Which form of energy is stored in a stretched rubber band? Answer: Potential energy
12. What is the boiling point of water on the Kelvin scale? Answer: 373.15 \text{ K} (or 373 \text{ K})
13. Which color of light deviates the least through a prism? Answer: Red
14. What device converts mechanical energy into electrical energy? Answer: Dynamo or Generator
15. What is the primary source of energy for the sun and stars? Answer: Nuclear fusion
16. Which quantity remains constant in a simple harmonic motion (SHM)? Answer: Total mechanical energy
17. What lens is used to correct myopia (nearsightedness)? Answer: Concave lens
18. What is the SI unit of work and energy? Answer: Joule
19. Which subatomic particle has a negative electric charge? Answer: Electron
20. What is the frequency range of audible sound for humans? Answer: 20 \text{ Hz} to 20,000 \text{ Hz}

objective physics

1.  ​What is the S.I. unit of electric current? (A) Volt (B) Ampere (C) Ohm (D) Watt Answer: (B) Ampere
2. ​Which mirror is used by dentists to view an enlarged image of teeth? (A) Convex mirror (B) Plane mirror (C) Concave mirror (D) Cylindrical mirror Answer: (C) Concave mirror
3. ​The focal length of a spherical mirror with a radius of curvature of 40 cm is: (A) 20 cm (B) 40 cm (C) 80 cm (D) 10 cm Answer: (A) 20 cm
4. ​The least distance of distinct vision for a normal human eye is: (A) 25 m (B) 2.5 cm (C) 25 cm (D) Infinity Answer: (C) 25 cm
5. ​Which instrument is used to measure potential difference across a circuit? (A) Ammeter (B) Voltmeter (C) Galvanometer (D) Rheostat Answer: (B) Voltmeter
6. ​The splitting of white light into its seven component colors by a glass prism is called: (A) Reflection (B) Refraction (C) Dispersion (D) Scattering Answer: (C) Dispersion
7. ​A concave lens always forms an image that is: (A) Real and inverted (B) Virtual and erect (C) Real and magnified (D) Virtual and inverted Answer: (B) Virtual and erect
8. ​The S.I. unit of power of a lens is: (A) Meter (B) Watt (C) Diopter (D) Joule Answer: (C) Diopter
9. ​The resistance of a conductor is inversely proportional to its: (A) Length (B) Area of cross-section (C) Temperature (D) Resistivity Answer: (B) Area of cross-section
10. ​A person unable to see nearby objects clearly suffers from: (A) Myopia (B) Hypermetropia (C) Presbyopia (D) Cataract Answer: (B) Hypermetropia
11. ​The commercial unit of electrical energy (1 kWh) is equal to: (A) 3.6 x 10^6 J (B) 3.6 x 10^5 J (C) 1000 J (D) 360 J Answer: (A) 3.6 x 10^6 J
12. ​The magnetic field lines inside a current-carrying straight solenoid are: (A) Circular (B) Parabolic (C) Parallel straight lines (D) Spiral Answer: (C) Parallel straight lines
13. ​A device that converts mechanical energy into electrical energy is called a: (A) Electric motor (B) Electric generator (C) Transformer (D) Galvanometer Answer: (B) Electric generator
14. ​According to Fleming's Left-Hand Rule, the forefinger points in the direction of: (A) Electric current (B) Magnetic field (C) Force on the conductor (D) Motion of the conductor Answer: (B) Magnetic field
15. ​The blue color of the sky is primarily due to: (A) Reflection of light (B) Refraction of light (C) Scattering of light (D) Total internal reflection Answer: (C) Scattering of light 

Objective Physics

Here are 10 MCQs covering Class 10 Physics topics common to both Bihar Board and CBSE (Light, Electricity, Magnetism):

**1.** The power of a lens is +2.0 D. The lens is:

a) Concave, f = 50 cm

b) Convex, f = 50 cm

c) Concave, f = 200 cm

d) Convex, f = 20 cm

**Answer: b**

**2.** SI unit of electrical resistivity is:

a) Ohm

b) Ohm-metre

c) Ohm/metre

d) Siemens

**Answer: b**

**3.** Which mirror is used as a rear-view mirror in vehicles?

a) Plane mirror

b) Concave mirror

c) Convex mirror

d) Cylindrical mirror

**Answer: c**

**4.** The phenomenon responsible for the blue color of the sky is:

a) Reflection

b) Refraction

c) Scattering

d) Dispersion

**Answer: c**

**5.** Two resistors of 4 Ω and 6 Ω are connected in parallel. The equivalent resistance is:

a) 10 Ω

b) 2.4 Ω

c) 5 Ω

d) 24 Ω

**Answer: b**

**6.** The magnetic field lines inside a current-carrying solenoid are:

a) Circular

b) Parallel straight lines

c) Zero

d) Radiating outward

**Answer: b**

**7.** A person cannot see distant objects clearly. This defect is called:

a) Hypermetropia

b) Myopia

c) Presbyopia

d) Astigmatism

**Answer: b**

**8.** Which device converts mechanical energy into electrical energy?

a) Electric motor

b) Generator

c) Transformer

d) Battery

**Answer: b**

**9.** The refractive index of a medium depends on:

a) Color of light

b) Nature of medium

c) Both a and b

d) Neither a nor b

**Answer: c**

**10.** Fuse wire used in domestic circuits is made of an alloy with:

a) High resistance and high melting point

b) Low resistance and low melting point

c) Low resistance and high melting point

d) High resistance and low melting point

**Answer: b**

Want me to make more sets by chapter (Light, Electricity, Magnetism separately) for PYQBank.in, or format these into a doc/spreadsheet?