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Physics - MOST IMPORTANT SSC Selection Phase Previous Year Questions

Practice real questions from previous year exams of SSC Selection Phase.

📘 Instruments to Measure things📚 List of Instruments to Measure Physical Quantities

Q1

Name the instrument which is used by meteorologists to measure the hemispherical area of incidence of solar radiation on a flat surface?

🎯 SSC Selection Phases XI– 27/06/2023 (Shift-I)

A.

Hygrameter

B.

Anemometer

C.

Pyranometer

D.

Barometer

📘 Light and Optics📚 Power of Lens

Q2

What will be the focal length of a convex lens if the power of this lens is +2.5 diopter.

🎯 SSC Selection Phases XI– 28/06/2023 (Shift-II)

A.

$\displaystyle 20$ cm

B.

$\displaystyle 5$ cm

C.

$\displaystyle 40$ cm

D.

$\displaystyle 10$ cm

📘 Sound📚 The Doppler Effect

Q3

The Doppler effect describes the change in observed frequency of a wave when there is relative motion between the source of the wave and the observer. Which of the following scenarios illustrates the Doppler effect for sound?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Light from a distant star appears shifted towards the red end of the spectrum.

B.

A stationary observer hears a change in the pitch of a siren as an ambulance passes by.

C.

Water waves bend as they move from deep to shallow water.

D.

Sunlight is dispersed into different colors when it passes through a prism.

📘 Force and Motion📚 Momentum-II: Conservation of Momentum

Q4

Which of the following scenarios best illustrates the principle of conservation of momentum?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

A ball rolling down a frictionless incline increases its speed.

B.

A car comes to a stop when the brakes are applied due to friction.

C.

When a bullet is fired from a gun, the gun recoils in the opposite direction.

D.

A satellite maintains a stable orbit around the Earth due to gravity.

📘 Light and Optics📚 Total Internal Reflection and Critical Angle

Q5

The phenomenon of total internal reflection can occur when light travels from:

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

A rarer medium to a denser medium at any angle of incidence.

B.

A denser medium to a rarer medium at any angle of incidence.

C.

A rarer medium to a denser medium at an angle of incidence greater than the critical angle.

D.

A denser medium to a rarer medium at an angle of incidence greater than the critical angle.

📘 Wave Optics📚 Interference

Q6

The phenomenon of interference in light waves is a direct consequence of:

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Light being composed of particles (photons).

B.

The diffraction of light around obstacles.

C.

The superposition principle of waves.

D.

The polarization of light waves.

📘 Force and Motion📚 Physical Quantities related to Motion- acceleration, displacement, etc.

Q7

A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the magnitude of its acceleration?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

$\displaystyle 2$ m/s²

B.

$\displaystyle 4$ m/s²

C.

$\displaystyle 10$ m/s²

D.

$\displaystyle 25$ m/s²

📘 Force and Motion📚 Physical Quantities related to Motion- acceleration, displacement, etc.

Q8

Which of the following statements best describes the relationship between velocity and acceleration in different dimensions?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

In one-dimensional motion, velocity and acceleration are always perpendicular to each other.

B.

In two-dimensional motion, acceleration must always act opposite to velocity.

C.

In one-dimensional motion, velocity and acceleration lie along the same line, either in the same or opposite direction.

D.

In three-dimensional motion, velocity and acceleration must always act in the same direction

📘 Units and Dimensions📚 Dimensional Formula of Physical Quantities

Q9

Which of the following statements is correct with respect to dimensional analysis?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

An equation that is dimensionally consistent is always physically correct.

B.

Dimensional analysis can verify both the magnitude and the physical validity of an equation

C.

Trigonometric and logarithmic functions are valid only when applied to quantities that are dimensionless

D.

Refractive index has dimensions because it involves the speed of light

📘 Magnetism📚 Transformer

Q10

To modify the magnitude of an alternating voltage without altering its frequency, which principle is applied in the functioning of a transformer?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Self-induction

B.

Electromagnetic radiation

C.

Mutual induction

D.

Capacitive coupling

📘 Current Electricity📚 Resistance, Resistivity and specific resistance

Q11

What happens to the resistance of a conductor as temperature increases?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

It decreases

B.

It increases

C.

It remains the same

D.

It fluctuates

📘 Current Electricity📚 Resistance, Resistivity and specific resistance

Q12

If the length of a wire is doubled and its thickness (cross-sectional area) is reduced to half, what will be the effect on its electrical resistance?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

It becomes one-fourth

B.

It remains unchanged

C.

It becomes four times

D.

It becomes half

📘 Human Eye📚 Working of the Human Eye

Q13

What happens to the pupil in low light conditions?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

It contracts to prevent excess light from entering

B.

It expands to allow more light to enter

C.

It remains the same size

D.

It changes color

📘 Fluid Mechanics📚 Pressure measuring devices- barometer, manometer, etc.

Q14

Which of the following is measured using a barometer?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Distance

B.

Pressure

C.

Speed

D.

Temperature

📘 Force and Motion📚 Newton's Third Law of Motion

Q15

Which principle explains how rockets are propelled forward when fuel is ejected in the opposite direction?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Newton’s First Law of Motion

B.

Law of Conservation of Mass

C.

Newton’s Third Law of Motion

D.

Law of Gravitation

📘 Force and Motion📚 Scalar and Vector Quantities

Q16

What is the difference between displacement and distance?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Distance includes direction; displacement does not

B.

Displacement includes direction; distance does not

C.

Both are scalar quantities

D.

Both are vector quantities

📘 Force and Motion📚 Newton's Third Law of Motion

Q17

Which statement best explains Newton's Third Law of Motion?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Force = mass × acceleration

B.

Energy cannot be created or destroyed

C.

For every action, there is an equal and opposite reaction

D.

The acceleration is inversely proportional to mass

📘 Work, Energy and Power📚 Forms of Energy- Kinetic Energy and Potential Energy

Q18

What happens to the kinetic energy of a moving object if its velocity is tripled?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

It becomes $\displaystyle 6$ times

B.

It becomes $\displaystyle 9$ times

C.

It becomes $\displaystyle 3$ times

D.

It becomes $\displaystyle 12$ times

📘 Force and Motion📚 Circular Motion and related terms (angular displacement, time period, etc.)

Q19

A stone is moving in a circular path with constant speed. Which of the following statements about its motion is correct?

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

The stone has zero acceleration because its speed is constant.

B.

The direction of the stone’s velocity remains unchanged.

C.

The stone experiences a constant acceleration directed towards the centre of the circle

D.

The motion of the stone is considered non-uniform because its speed varies.

📘 Natural Phenomenon📚 Misc

Q20

Fill in the blank:
The phenomenon where the Sun, Earth, and Moon align to cause a total or partial shadow is called a ______.

🎯 SSC Selection Phase (Phase-XIII) 2025

A.

Eclipse

B.

Transit

C.

Conjunction

D.

Revolution

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