CDS Physics Questions with Answers & Explanations

The bending of light when it passes from one medium to another is called

1. ADiffraction
2. BRefraction
3. CReflection
4. DDispersion

The SI unit of frequency is the

1. ADecibel
2. BHertz
3. CTesla
4. DWatt

Ultrasound has a frequency greater than

1. A20,000 Hz
2. B200 Hz
3. C20 Hz
4. D2,000 Hz

The SI unit of force is the

1. ANewton
2. BJoule
3. CWatt
4. DPascal

The sky appears blue because of

1. AReflection of light
2. BRefraction of light
3. CDispersion of light
4. DScattering of light

The SI unit of pressure is the

1. ABar
2. BPascal
3. CNewton
4. DJoule

Which lens is used to correct myopia (short-sightedness)?

1. AConvex lens
2. BCylindrical lens
3. CBifocal lens
4. DConcave lens

Newton's first law of motion is also called the law of

1. AInertia
2. BAcceleration
3. CMomentum
4. DGravitation

Which colour of light has the longest wavelength?

1. ARed
2. BGreen
3. CViolet
4. DBlue

The instrument used to measure electric current is the

1. AAmmeter
2. BGalvanometer only
3. CVoltmeter
4. DOhmmeter

The speed of light in vacuum is about

1. A3 × 10⁸ m/s
2. B3 × 10⁶ m/s
3. C3 × 10⁵ m/s
4. D340 m/s

The SI unit of electric current is the

1. ACoulomb
2. BAmpere
3. CVolt
4. DOhm

The acceleration due to gravity on Earth is about

1. A10.8 m/s²
2. B1.6 m/s²
3. C8.9 m/s²
4. D9.8 m/s²

Absolute zero temperature is

1. A−459 °C
2. B−273.15 °C
3. C−100 °C
4. D0 °C

The SI unit of electrical resistance is the

1. AOhm
2. BVolt
3. CAmpere
4. DFarad

The SI unit of pressure is the

1. ANewton
2. BJoule
3. CBar
4. DPascal

Absolute zero temperature is

1. A−273.15 °C
2. B0 °C
3. C−100 °C
4. D−459 °C

A rainbow is formed due to

1. AOnly reflection
2. BPolarisation
3. CDispersion and total internal reflection of light
4. DScattering only

The SI unit of power is the

1. AVolt
2. BWatt
3. CAmpere
4. DJoule

Newton's first law of motion is also called the law of

1. AGravitation
2. BMomentum
3. CInertia
4. DAcceleration