Q. What is the phase difference between two waves that interfere constructively?
Show solution
Solution
Constructive interference occurs when the phase difference is an integer multiple of 2π, which corresponds to a phase difference of 0.
Correct Answer: A — 0
Learn More →
Q. What is the phase difference between two waves that interfere destructively?
A.
0 radians
B.
π/2 radians
C.
π radians
D.
3π/2 radians
Show solution
Solution
Destructive interference occurs when the phase difference is π radians (or an odd multiple of π).
Correct Answer: C — π radians
Learn More →
Q. What is the phenomenon called when a changing magnetic field induces an electric current in a conductor?
A.
Electromagnetic induction
B.
Electrolysis
C.
Magnetic resonance
D.
Thermal conduction
Show solution
Solution
The phenomenon of inducing an electric current in a conductor due to a changing magnetic field is known as electromagnetic induction.
Correct Answer: A — Electromagnetic induction
Learn More →
Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a conductor?
A.
Electromagnetic induction
B.
Magnetic resonance
C.
Electrolysis
D.
Magnetization
Show solution
Solution
The phenomenon of inducing an EMF in a conductor due to a changing magnetic field is known as electromagnetic induction.
Correct Answer: A — Electromagnetic induction
Learn More →
Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a circuit?
A.
Electromagnetic induction
B.
Magnetic resonance
C.
Electrolysis
D.
Magnetization
Show solution
Solution
The phenomenon is known as electromagnetic induction, as described by Faraday's law.
Correct Answer: A — Electromagnetic induction
Learn More →
Q. What is the phenomenon called when a conductor moves through a magnetic field and generates an electric current?
A.
Electromagnetic induction
B.
Magnetic hysteresis
C.
Electrostatic induction
D.
Magnetic flux
Show solution
Solution
This phenomenon is known as electromagnetic induction, where a changing magnetic field induces an electric current in a conductor.
Correct Answer: A — Electromagnetic induction
Learn More →
Q. What is the phenomenon called when a liquid changes to gas at a temperature below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Freezing
Show solution
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
Learn More →
Q. What is the phenomenon called when a liquid changes to gas at temperatures below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Vaporization
Show solution
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
Learn More →
Q. What is the phenomenon called when a liquid rises in a narrow tube against gravity?
A.
Capillarity
B.
Viscosity
C.
Surface tension
D.
Hydrostatic pressure
Show solution
Solution
Capillarity is the phenomenon where a liquid rises in a narrow tube against gravity due to adhesive and cohesive forces.
Correct Answer: A — Capillarity
Learn More →
Q. What is the phenomenon called when an electron transitions from a higher energy level to a lower energy level in an atom?
A.
Ionization
B.
Excitation
C.
Emission
D.
Absorption
Show solution
Solution
When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of a photon, a process known as emission.
Correct Answer: C — Emission
Learn More →
Q. What is the phenomenon called when electrons are emitted from a metal surface when it is exposed to light?
A.
Photoelectric effect
B.
Compton effect
C.
Rayleigh scattering
D.
Black body radiation
Show solution
Solution
The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.
Correct Answer: A — Photoelectric effect
Learn More →
Q. What is the phenomenon called when light waves are restricted to vibrate in a single plane?
A.
Refraction
B.
Diffraction
C.
Polarization
D.
Interference
Show solution
Solution
The phenomenon of light waves being restricted to vibrate in a single plane is called polarization.
Correct Answer: C — Polarization
Learn More →
Q. What is the phenomenon called when light waves bend around the edges of an obstacle?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
Show solution
Solution
The bending of light waves around the edges of an obstacle is known as diffraction.
Correct Answer: C — Diffraction
Learn More →
Q. What is the phenomenon called when sound waves bend around obstacles?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
Show solution
Solution
The bending of sound waves around obstacles is known as diffraction.
Correct Answer: C — Diffraction
Learn More →
Q. What is the phenomenon of diffraction primarily associated with?
A.
Reflection of light
B.
Bending of waves around obstacles
C.
Interference of waves
D.
Polarization of light
Show solution
Solution
Diffraction is the bending of waves around obstacles and the spreading of waves when they pass through small openings.
Correct Answer: B — Bending of waves around obstacles
Learn More →
Q. What is the phenomenon of diffraction primarily responsible for?
A.
Bending of light around obstacles
B.
Reflection of light
C.
Refraction of light
D.
Polarization of light
Show solution
Solution
Diffraction is the bending of waves around obstacles and the spreading of waves when they pass through small openings.
Correct Answer: A — Bending of light around obstacles
Learn More →
Q. What is the phenomenon of electromagnetic induction?
A.
The generation of electric current by a changing magnetic field
B.
The generation of magnetic field by a changing electric current
C.
The interaction between electric and magnetic fields
D.
The conversion of mechanical energy into electrical energy
Show solution
Solution
Electromagnetic induction refers to the generation of electric current in a conductor due to a changing magnetic field.
Correct Answer: A — The generation of electric current by a changing magnetic field
Learn More →
Q. What is the phenomenon of polarization in light?
A.
The splitting of light into different colors
B.
The alignment of light waves in a particular direction
C.
The reflection of light off a surface
D.
The bending of light as it passes through a medium
Show solution
Solution
Polarization refers to the orientation of the oscillations of light waves in a particular direction.
Correct Answer: B — The alignment of light waves in a particular direction
Learn More →
Q. What is the photoelectric effect primarily used for in technology?
A.
Solar panels
B.
LEDs
C.
Lasers
D.
Television screens
Show solution
Solution
The photoelectric effect is primarily used in solar panels to convert light energy into electrical energy.
Correct Answer: A — Solar panels
Learn More →
Q. What is the photoelectric effect?
A.
Emission of electrons from a metal surface when light shines on it
B.
Absorption of light by a metal surface
C.
Reflection of light from a metal surface
D.
Transmission of light through a metal surface
Show solution
Solution
The photoelectric effect is the phenomenon where electrons are emitted from a metal surface when it is exposed to light of sufficient frequency.
Correct Answer: A — Emission of electrons from a metal surface when light shines on it
Learn More →
Q. What is the pKa value of acetic acid?
A.
4.76
B.
7.00
C.
9.25
D.
2.00
Show solution
Solution
The pKa value of acetic acid is approximately 4.76.
Correct Answer: A — 4.76
Learn More →
Q. What is the pKb value of a strong base?
A.
Less than 0
B.
Equal to 0
C.
Greater than 0
D.
Equal to 14
Show solution
Solution
A strong base has a pKb value less than 0, indicating high basicity.
Correct Answer: A — Less than 0
Learn More →
Q. What is the pKb value of a weak base?
A.
Less than 7
B.
Equal to 7
C.
Greater than 7
D.
None of the above
Show solution
Solution
A weak base has a pKb value greater than 7.
Correct Answer: C — Greater than 7
Learn More →
Q. What is the potential at a distance of 1 m from a dipole with a dipole moment of 2 × 10^-9 C·m?
A.
0 V
B.
1 V
C.
2 V
D.
4 V
Show solution
Solution
Potential due to a dipole V = (1/4πε₀) * (p * cosθ) / r². At 1 m, it is negligible.
Correct Answer: A — 0 V
Learn More →
Q. What is the potential difference across a 10 ohm resistor carrying a current of 2A?
A.
5V
B.
10V
C.
15V
D.
20V
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 10 ohms = 20V.
Correct Answer: D — 20V
Learn More →
Q. What is the potential difference across a 10Ω resistor if a current of 2A flows through it?
A.
5V
B.
10V
C.
20V
D.
15V
Show solution
Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: C — 20V
Learn More →
Q. What is the potential difference across a 10Ω resistor if a current of 4A flows through it?
A.
20V
B.
40V
C.
10V
D.
30V
Show solution
Solution
Using Ohm's Law, V = I * R = 4A * 10Ω = 40V.
Correct Answer: A — 20V
Learn More →
Q. What is the potential difference across a 5 Ω resistor carrying a current of 2 A?
A.
10 V
B.
5 V
C.
2 V
D.
0 V
Show solution
Solution
Using Ohm's law, V = I * R = 2 A * 5 Ω = 10 V.
Correct Answer: A — 10 V
Learn More →
Q. What is the potential difference across the galvanometer in a balanced Wheatstone bridge?
A.
Zero
B.
Equal to the supply voltage
C.
Depends on the resistances
D.
Half of the supply voltage
Show solution
Solution
In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flows through it.
Correct Answer: A — Zero
Learn More →
Q. What is the potential difference between two points A and B if the electric field is uniform and equal to 50 N/C, and the distance between A and B is 2m?
A.
100 V
B.
50 V
C.
25 V
D.
0 V
Show solution
Solution
Potential difference V = E * d = 50 N/C * 2 m = 100 V.
Correct Answer: A — 100 V
Learn More →
Showing 7651 to 7680 of 10700 (357 Pages)