MATRIC • FSC • NTS • ETEA • CSS • PMS etc MCQs Learn, Practice, Prepare, Succeed! Prepare Today, Succeed Tomorrow!

Q: Which one of the following properties of electromagnetic waves does not change in vacuum? (Entry test 2012)

A) Speed

B) Wavelength

C) Frequency

D) Intensity

Q: The intensity of a wave is (Entry test 2012)

A) Directly proportional to amplitude

B) Directly proportional to amplitude²

C) Inversely proportional to amplitude

D) Inversely proportional to amplitude²

Q: The refractive index of a medium using light waves is given by (Entry test 2009)

A) n = c/v

B) n = v/c

C) n = v·c

D) n = v/c²

Q: If green light in Young’s double-slit experiment is replaced by monochromatic orange light of the same intensity then (Entry test 2009)

A) Fringe width will decrease

B) Fringe width will increase

C) Fringe width will remain the same

D) Fringes will be less intense

Q: In an open organ pipe of length L, the wavelength of the fundamental note is (Entry test 2009)

A) Equal to L

B) Equal to 2L

C) Equal to 4L

D) Equal to 3L/2

Q: If a wave can be polarized, it must be (Entry test 2009)

A) Progressive wave

B) Stationary wave

C) Longitudinal wave

D) Transverse wave

Q: When sound waves move from one medium to another, the quantity which remains unchanged is (Entry test 2010)

A) Wavelength

B) Frequency

C) Speed

D) Intensity

Q: The wave velocity in any medium depends upon (Entry test 2010)

A) Elasticity

B) Density

C) Homogeneity

D) All of the above

Q: The waves which do not require any medium for their propagation are called (Entry test 2014)

A) Mechanical waves

B) Tidal waves

C) Sound waves

D) Electromagnetic waves

Q: We can hear sound around the corner but cannot see because of (Entry test 2011)

A) Interference

B) Diffraction

C) Polarization

D) Dispersion

Q: If the amplitude of a wave at a distance r from a point source is A, then amplitude at a distance 2r is (Entry test 2005)

A) 2A

B) A

C) A/2

D) A/4

Q: A particle performs simple harmonic motion of amplitude 0.02 m and frequency 2.5 Hz. What is the maximum speed? (Entry test 2009)

A) 0.008 m/s⁻¹

B) 0.314 m/s⁻¹

C) 0.125 m/s⁻¹

D) 0.05 m/s⁻¹

Q: In a stationary wave the vibrations of particles in two adjacent segments differ in phase by (Entry test 2012)

A) 0 rad

B) π/2

C) π

D) 3π/2

Q: Two notes of frequencies f1 and f2 are sounded together and beats are formed (f1 > f2). The beat frequency will be (Entry test 2012)

A) f1+f2

B) 1/2(f1+f2)

C) f1−f2

D) 1/2(f1−f2)

Q: The fundamental frequency of an open organ pipe is greater than that of a closed organ pipe by (Entry test 2009)

A) V/4L

B) V/2L

C) 3V/2L

D) 2V/3L

Q: The ratio between the velocity of sound in air at 4 atm and that at 1 atm pressure is (Entry test 2010)

A) 1:1

B) 4:1

C) 1:4

D) 3:1

Q: An electron has charge −e and mass m. A proton has charge +e and mass 1840 m. A 'proton volt' is equal to: (Entry test 2016)

A) 1 eV

B) 1840 eV

C) 1/1840 eV

D) 1840 eV

Q: Starting from rest, a proton and an α-particle are accelerated through the same potential difference. The ratio of their final speeds V_p / V_α is: (Entry test 2015)

A) 1/2

B) 1

C) √2

D) 2

Q: The force on an electron in an electric field of 10⁸ NC⁻¹ is approximately: (Entry test 2014)

A) 1.6×10¹⁹ N

B) 1.6×10⁻⁸ N

C) 1.6×10⁻¹⁰ N

D) 1.6×10⁻¹¹ N

Q: Which of the following is the same unit as the farad? (Entry test 2014)

A) Ωs

B) Ωs⁻¹

C) Ω⁻¹ s

D) Ω⁻¹s⁻¹