SI unit of force
Answer / solution
Correct option: B
N = kg·m/s².
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Physics formulas for Class 9–12 and exam revision
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150 important Mathematics questions
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SI unit of work / energy
Answer / solution
Correct option: D
1 J = 1 N·m.
SI unit of power
Answer / solution
Correct option: B
1 W = 1 J/s.
SI unit of pressure
Answer / solution
Correct option: D
1 Pa = 1 N/m².
SI unit of electric current
Answer / solution
Correct option: D
Base SI unit.
SI unit of resistance
Answer / solution
Correct option: C
V/I.
SI unit of frequency
Answer / solution
Correct option: C
1/s.
Acceleration due to gravity near Earth (approx.)
Answer / solution
Correct option: D
Often taken 10 in exams.
Speed of light in vacuum (approx.)
Answer / solution
Correct option: C
c = 3×10⁸.
Charge of an electron
Answer / solution
Correct option: B
−1.6×10⁻¹⁹ C.
Newton’s first law is also called
Answer / solution
Correct option: D
Velocity stays unless a force acts.
Newton’s second law
Answer / solution
Correct option: D
Net force equals mass × acceleration.
Newton’s third law
Answer / solution
Correct option: C
Equal and opposite forces.
Momentum is
Answer / solution
Correct option: B
p = mv.
Work done by a force
Answer / solution
Correct option: A
Displacement component along force.
Kinetic energy
Answer / solution
Correct option: C
Energy of motion.
Potential energy (gravity near Earth)
Answer / solution
Correct option: A
Height energy.
Power is
Answer / solution
Correct option: A
Rate of doing work.
Ohm’s law
Answer / solution
Correct option: B
At constant temperature for ohmic resistors.
Electric power
Answer / solution
Correct option: D
Also V²/R.
Frequency and time period
Answer / solution
Correct option: C
Reciprocals.
Wavelength relation
Answer / solution
Correct option: D
Wave speed.
Convex lens is used as
Answer / solution
Correct option: A
Converges parallel rays.
Concave mirror can form
Answer / solution
Correct option: B
Depends on object position.
Sound cannot travel in
Answer / solution
Correct option: B
Needs a material medium.
Light year measures
Answer / solution
Correct option: D
Distance light travels in one year.
Scalar quantity example
Answer / solution
Correct option: C
No direction.
Vector quantity example
Answer / solution
Correct option: D
Has direction.
Escape velocity of Earth (approx.)
Answer / solution
Correct option: C
Standard value.
1 kWh equals
Answer / solution
Correct option: B
Commercial unit of energy.
Device that converts AC to DC
Answer / solution
Correct option: A
Diode rectifier.
Device that converts DC to AC
Answer / solution
Correct option: D
Not a transformer.
Transformer works on
Answer / solution
Correct option: B
AC only.
SI unit of magnetic field
Answer / solution
Correct option: C
Also gauss (CGS).
Focal length of a plane mirror
Answer / solution
Correct option: B
No converging power.
Image in a plane mirror is
Answer / solution
Correct option: B
Same size.
Refractive index of vacuum / air (approx.)
Answer / solution
Correct option: D
n = c/v.
Snell’s law relates
Answer / solution
Correct option: D
Refraction.
Heat required to change state (no temp change)
Answer / solution
Correct option: B
Fusion or vaporisation.
SI unit of temperature (thermodynamic)
Answer / solution
Correct option: B
K = °C + 273.
Absolute zero is
Answer / solution
Correct option: A
Lowest temperature.
First law of thermodynamics is
Answer / solution
Correct option: B
ΔU = Q − W (sign convention may vary).
Density of water
Answer / solution
Correct option: B
1 g/cm³.
Atmospheric pressure (approx.)
Answer / solution
Correct option: A
1 atm ≈ 1.01×10⁵ Pa.
Archimedes’ principle is about
Answer / solution
Correct option: C
Equals weight of displaced fluid.
Pascal’s law is used in
Answer / solution
Correct option: D
Pressure transmission.
Kepler’s 3rd law
Answer / solution
Correct option: C
Planetary periods.
Centripetal force (circular)
Answer / solution
Correct option: B
Towards centre.
Hooke’s law
Answer / solution
Correct option: C
Within elastic limit.
Young’s modulus relates
Answer / solution
Correct option: C
Longitudinal elasticity.
Ultrasound frequency is above
Answer / solution
Correct option: C
Above audible range.
Audible range (human)
Answer / solution
Correct option: B
Typical textbook range.
Red light has wavelength longer than
Answer / solution
Correct option: B
Red is longest in visible.
Primary colours of light
Answer / solution
Correct option: C
Additive mixing.
Myopia is corrected by
Answer / solution
Correct option: C
Diverging lens.
Hypermetropia is corrected by
Answer / solution
Correct option: C
Converging lens.
SI unit of capacitance
Answer / solution
Correct option: B
C/V.
Energy stored in a capacitor
Answer / solution
Correct option: B
Also Q²/2C.
Coulomb’s law is for
Answer / solution
Correct option: A
F ∝ q1q2/r².
Magnetic field around a current
Answer / solution
Correct option: C
Right-hand thumb rule.
Fleming’s left-hand rule is for
Answer / solution
Correct option: C
Force on a current in B-field.
Fleming’s right-hand rule is for
Answer / solution
Correct option: A
Induced current.
Photoelectric effect supports
Answer / solution
Correct option: B
Einstein explanation.
Radioactivity was discovered by
Answer / solution
Correct option: D
Uranium salts.
α particle is
Answer / solution
Correct option: C
2p 2n.
β particle is
Answer / solution
Correct option: A
From nucleus.
γ ray is
Answer / solution
Correct option: D
No charge.
Half-life is
Answer / solution
Correct option: D
Exponential decay.
Nuclear fission is used in
Answer / solution
Correct option: B
Heavy nuclei split.
Nuclear fusion occurs in
Answer / solution
Correct option: B
Light nuclei combine.
1 a.m.u. energy equivalent (approx.)
Answer / solution
Correct option: B
Mass–energy.
Least count of a vernier (typical 10 div)
Answer / solution
Correct option: B
If 1 MSD = 1 mm.
Dimensional formula of force
Answer / solution
Correct option: B
From F=ma.
Dimensional formula of energy
Answer / solution
Correct option: B
Same as work.
g is maximum at
Answer / solution
Correct option: D
Earth not a perfect sphere; poles closer.
Weight is
Answer / solution
Correct option: D
Force due to gravity.
Mass is
Answer / solution
Correct option: D
Independent of g.
Inelastic collision conserves
Answer / solution
Correct option: C
KE is not conserved.
Elastic collision conserves
Answer / solution
Correct option: C
Ideal case.
Moment of force is
Answer / solution
Correct option: A
Turning effect.
Centre of gravity of a uniform rod is at
Answer / solution
Correct option: C
Geometric centre.
SHM restoring force is
Answer / solution
Correct option: A
Simple harmonic.
Time period of a simple pendulum (small θ)
Answer / solution
Correct option: C
Independent of mass.
Resonance occurs when
Answer / solution
Correct option: A
Large amplitude.
Beats frequency
Answer / solution
Correct option: A
Two close frequencies.
Doppler effect is change in
Answer / solution
Correct option: B
Relative motion source/observer.
Total internal reflection needs
Answer / solution
Correct option: A
Optical fibre.
Power of a lens
Answer / solution
Correct option: D
P = 1/f.
Combination of two thin lenses in contact
Answer / solution
Correct option: D
Net power adds.
Rainbow is due to
Answer / solution
Correct option: D
Sunlight spectrum.
White light through a prism shows
Answer / solution
Correct option: B
Violet bends more.
Eddy currents are reduced by
Answer / solution
Correct option: A
Thin insulated sheets.
RMS value of AC (sinusoidal)
Answer / solution
Correct option: B
Heating equivalent.
Average power in AC (resistive)
Answer / solution
Correct option: A
cosφ = 1.
Lenz’s law gives
Answer / solution
Correct option: D
Opposes the change.
Faraday’s law
Answer / solution
Correct option: A
Induced emf.
SI unit of magnetic flux
Answer / solution
Correct option: A
Wb.
Earth’s magnetic field is of order
Answer / solution
Correct option: A
About 0.25–0.65 G.
Superconductor resistance is
Answer / solution
Correct option: B
Ideal conductivity.
LED works on
Answer / solution
Correct option: A
Semiconductor light.
Solar cell converts
Answer / solution
Correct option: A
Photovoltaic.
Logic 1 AND 0 is
Answer / solution
Correct option: A
AND gate.
Logic 1 OR 0 is
Answer / solution
Correct option: D
OR gate.
NOT of 1 is
Answer / solution
Correct option: B
Inverter.
NAND is
Answer / solution
Correct option: D
Universal gate.
SI unit of activity (radioactivity)
Answer / solution
Correct option: D
1 Bq = 1 decay/s.
Moderator in a reactor
Answer / solution
Correct option: A
Graphite / heavy water.
Control rods
Answer / solution
Correct option: A
Cadmium / boron.
V=12 V, I=5 A. Electric power is
Answer / solution
Correct option: A
P=VI = 60 W.
KE of mass 6 kg at 12 m/s is
Answer / solution
Correct option: C
½mv² = 432 J.
PE of 2 kg raised 11 m (g=10) is
Answer / solution
Correct option: A
mgh = 220 J.
Wave: f=60 Hz, λ=3 m. Speed is
Answer / solution
Correct option: D
v=fλ = 180 m/s.
A mass of 6 kg accelerates at 5 m/s². Force is
Answer / solution
Correct option: A
F=ma = 30 N.
u=0, a=5 m/s², t=5 s. Final speed v is
Answer / solution
Correct option: B
v=u+at = 25 m/s.
Force 10 N moves a body 8 m along the force. Work is
Answer / solution
Correct option: C
W=Fs = 80 J.
V=12 V, I=5 A. Resistance is
Answer / solution
Correct option: D
R=V/I = 2 Ω.
V=12 V, I=3 A. Electric power is
Answer / solution
Correct option: A
P=VI = 36 W.
KE of mass 4 kg at 8 m/s is
Answer / solution
Correct option: C
½mv² = 128 J.
Wave: f=90 Hz, λ=6 m. Speed is
Answer / solution
Correct option: C
v=fλ = 540 m/s.
A mass of 2 kg accelerates at 3 m/s². Force is
Answer / solution
Correct option: B
F=ma = 6 N.
u=0, a=3 m/s², t=5 s. Final speed v is
Answer / solution
Correct option: A
v=u+at = 15 m/s.
Force 20 N moves a body 6 m along the force. Work is
Answer / solution
Correct option: D
W=Fs = 120 J.
V=16 V, I=5 A. Resistance is
Answer / solution
Correct option: C
R=V/I = 3 Ω.
V=12 V, I=6 A. Electric power is
Answer / solution
Correct option: A
P=VI = 72 W.
KE of mass 2 kg at 4 m/s is
Answer / solution
Correct option: D
½mv² = 16 J.
Wave: f=70 Hz, λ=4 m. Speed is
Answer / solution
Correct option: D
v=fλ = 280 m/s.
A mass of 4 kg accelerates at 6 m/s². Force is
Answer / solution
Correct option: B
F=ma = 24 N.
u=0, a=6 m/s², t=5 s. Final speed v is
Answer / solution
Correct option: A
v=u+at = 30 m/s.
Force 30 N moves a body 4 m along the force. Work is
Answer / solution
Correct option: A
W=Fs = 120 J.
V=20 V, I=5 A. Resistance is
Answer / solution
Correct option: A
R=V/I = 4 Ω.
V=12 V, I=4 A. Electric power is
Answer / solution
Correct option: A
P=VI = 48 W.
KE of mass 5 kg at 10 m/s is
Answer / solution
Correct option: B
½mv² = 250 J.
Wave: f=50 Hz, λ=2 m. Speed is
Answer / solution
Correct option: D
v=fλ = 100 m/s.
A mass of 6 kg accelerates at 4 m/s². Force is
Answer / solution
Correct option: B
F=ma = 24 N.
u=0, a=4 m/s², t=5 s. Final speed v is
Answer / solution
Correct option: D
v=u+at = 20 m/s.
Force 10 N moves a body 7 m along the force. Work is
Answer / solution
Correct option: D
W=Fs = 70 J.
V=12 V, I=2 A. Electric power is
Answer / solution
Correct option: A
P=VI = 24 W.
KE of mass 3 kg at 6 m/s is
Answer / solution
Correct option: D
½mv² = 54 J.
Wave: f=80 Hz, λ=5 m. Speed is
Answer / solution
Correct option: A
v=fλ = 400 m/s.
A mass of 2 kg accelerates at 7 m/s². Force is
Answer / solution
Correct option: A
F=ma = 14 N.
u=0, a=2 m/s², t=5 s. Final speed v is
Answer / solution
Correct option: C
v=u+at = 10 m/s.
Force 20 N moves a body 5 m along the force. Work is
Answer / solution
Correct option: C
W=Fs = 100 J.
A mass of 4 kg accelerates at 5 m/s². Force is
Answer / solution
Correct option: B
F=ma = 20 N.
Force 30 N moves a body 8 m along the force. Work is
Answer / solution
Correct option: A
W=Fs = 240 J.
A mass of 6 kg accelerates at 3 m/s². Force is
Answer / solution
Correct option: A
F=ma = 18 N.
Force 10 N moves a body 6 m along the force. Work is
Answer / solution
Correct option: A
W=Fs = 60 J.
A mass of 2 kg accelerates at 6 m/s². Force is
Answer / solution
Correct option: B
F=ma = 12 N.
Force 20 N moves a body 4 m along the force. Work is
Answer / solution
Correct option: B
W=Fs = 80 J.
A mass of 4 kg accelerates at 4 m/s². Force is
Answer / solution
Correct option: A
F=ma = 16 N.
Force 30 N moves a body 7 m along the force. Work is
Answer / solution
Correct option: B
W=Fs = 210 J.
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No. Class 9–12 formulas are already curated on the CBSE formula pages. This hub is the subject doorway so “physics formulas” and “chemistry formulas” have a stable URL and point at those sheets.
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