Q. What is the kinetic energy of an object with a mass of 2 kg moving at a velocity of 3 m/s?
A.
3 J
B.
6 J
C.
9 J
D.
12 J
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Solution
Kinetic energy is calculated using the formula KE = 1/2 mv². Here, KE = 1/2 * 2 kg * (3 m/s)² = 9 J.
Correct Answer:
C
— 9 J
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Q. What is the kinetic energy of an object with a mass of 3 kg moving at a speed of 4 m/s?
A.
12 J
B.
24 J
C.
6 J
D.
48 J
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Solution
Kinetic energy is calculated using KE = 1/2 mv². Here, KE = 1/2 * 3 kg * (4 m/s)² = 24 J.
Correct Answer:
B
— 24 J
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Q. What is the latent heat of fusion for ice if 334 J is required to melt 1 g of ice?
A.
334 J/g
B.
667 J/g
C.
1000 J/g
D.
250 J/g
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Solution
The latent heat of fusion is the amount of heat required to convert 1 g of ice at 0°C to water at 0°C, which is 334 J/g.
Correct Answer:
A
— 334 J/g
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Q. What is the law that describes the relationship between the angles of incidence and refraction?
A.
Snell's Law
B.
Newton's Law
C.
Hooke's Law
D.
Faraday's Law
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Solution
Snell's Law states that n1 * sin(θ1) = n2 * sin(θ2), where n is the refractive index and θ is the angle.
Correct Answer:
A
— Snell's Law
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Q. What is the magnetic field strength at a distance of 0.1 m from a long straight wire carrying a current of 5 A?
A.
0.1 T
B.
0.01 T
C.
0.05 T
D.
0.02 T
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Solution
Using the formula B = (μ0 * I) / (2 * π * r), where μ0 = 4π x 10^-7 T m/A, B = (4π x 10^-7 * 5) / (2 * π * 0.1) = 0.01 T.
Correct Answer:
B
— 0.01 T
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Q. What is the main characteristic of a black body in physics?
A.
It reflects all incident light.
B.
It absorbs all incident light.
C.
It emits no radiation.
D.
It has a fixed temperature.
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Solution
A black body is an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
Correct Answer:
B
— It absorbs all incident light.
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Q. What is the main characteristic of a semiconductor?
A.
It conducts electricity poorly
B.
It has a high melting point
C.
It can conduct electricity under certain conditions
D.
It is always a good conductor
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Solution
Semiconductors can conduct electricity under certain conditions, such as when doped with impurities or when exposed to light.
Correct Answer:
C
— It can conduct electricity under certain conditions
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Q. What is the main idea behind Einstein's mass-energy equivalence?
A.
Mass can be converted into energy and vice versa.
B.
Energy is always conserved.
C.
Mass is a form of energy that cannot be transformed.
D.
Energy can only be created, not destroyed.
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Solution
Einstein's mass-energy equivalence, expressed as E=mc², states that mass can be converted into energy and vice versa, highlighting the interrelationship between mass and energy.
Correct Answer:
A
— Mass can be converted into energy and vice versa.
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Q. What is the main mechanism of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
None
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Solution
In a vacuum, heat transfer occurs primarily through radiation, as there are no particles to conduct or convect heat.
Correct Answer:
C
— Radiation
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Q. What is the main postulate of general relativity?
A.
Gravity is a force between masses.
B.
Mass warps spacetime, causing gravity.
C.
Time is the same for all observers.
D.
Light cannot escape from a black hole.
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Solution
General relativity posits that gravity is not a force but a curvature of spacetime caused by mass.
Correct Answer:
B
— Mass warps spacetime, causing gravity.
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Q. What is the moment of inertia for a solid cylinder about its central axis?
A.
1/2 m r^2
B.
m r^2
C.
1/3 m r^2
D.
m r
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Solution
The moment of inertia for a solid cylinder about its central axis is given by I = 1/2 m r^2.
Correct Answer:
A
— 1/2 m r^2
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Q. What is the moment of inertia for a solid cylinder rotating about its central axis?
A.
1/2 m r²
B.
m r²
C.
2/5 m r²
D.
1/3 m r²
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Solution
The moment of inertia for a solid cylinder rotating about its central axis is given by I = 1/2 m r², where m is mass and r is radius.
Correct Answer:
A
— 1/2 m r²
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Q. What is the moment of inertia of a solid cylinder about its central axis?
A.
1/2 m r^2
B.
1/3 m r^2
C.
m r^2
D.
m r^2 / 2
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Solution
The moment of inertia of a solid cylinder about its central axis is given by I = 1/2 m r^2.
Correct Answer:
A
— 1/2 m r^2
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Q. What is the momentum of a 10 kg object moving at 3 m/s?
A.
30 kg·m/s
B.
10 kg·m/s
C.
3 kg·m/s
D.
0 kg·m/s
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Solution
Momentum p = mv = 10 kg * 3 m/s = 30 kg·m/s.
Correct Answer:
A
— 30 kg·m/s
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Q. What is the momentum of a 2 kg object moving at a velocity of 3 m/s?
A.
6 kg·m/s
B.
5 kg·m/s
C.
3 kg·m/s
D.
2 kg·m/s
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Solution
Momentum is calculated as p = m × v, so p = 2 kg × 3 m/s = 6 kg·m/s.
Correct Answer:
A
— 6 kg·m/s
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Q. What is the momentum of a 3 kg object moving at 4 m/s?
A.
12 kg·m/s
B.
7 kg·m/s
C.
15 kg·m/s
D.
10 kg·m/s
Show solution
Solution
Momentum p = mv = 3 kg * 4 m/s = 12 kg·m/s.
Correct Answer:
A
— 12 kg·m/s
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Q. What is the momentum of a 5 kg object moving at a velocity of 4 m/s?
A.
20 kg·m/s
B.
15 kg·m/s
C.
10 kg·m/s
D.
25 kg·m/s
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Solution
Momentum p = mv = 5 kg × 4 m/s = 20 kg·m/s.
Correct Answer:
A
— 20 kg·m/s
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Q. What is the net force acting on a 10 kg object that is accelerating at 2 m/s²?
A.
20 N
B.
10 N
C.
5 N
D.
2 N
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Solution
Net force is calculated using F = ma, so F = 10 kg × 2 m/s² = 20 N.
Correct Answer:
A
— 20 N
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Q. What is the net force acting on a 5 kg object accelerating at 2 m/s²?
A.
5 N
B.
10 N
C.
15 N
D.
20 N
Show solution
Solution
Using Newton's second law, F = ma, F = 5 kg * 2 m/s² = 10 N.
Correct Answer:
B
— 10 N
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Q. What is the net force acting on a rigid body in equilibrium?
A.
Zero
B.
Equal to its weight
C.
Equal to its mass times acceleration
D.
Equal to the applied force
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Solution
In equilibrium, the net force acting on a rigid body is zero, meaning all forces balance out.
Correct Answer:
A
— Zero
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Q. What is the net force acting on a system of particles in equilibrium?
A.
Zero
B.
Equal to the mass of the system
C.
Equal to the acceleration of the system
D.
Equal to the gravitational force
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Solution
In a system of particles in equilibrium, the net force acting on the system is zero according to Newton's first law.
Correct Answer:
A
— Zero
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Q. What is the net force acting on an object in equilibrium?
A.
Zero
B.
Equal to its weight
C.
Equal to its mass
D.
Equal to the applied force
Show solution
Solution
In equilibrium, the net force acting on an object is zero, meaning all forces are balanced.
Correct Answer:
A
— Zero
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Q. What is the net force acting on an object in uniform motion?
A.
0 N
B.
10 N
C.
5 N
D.
20 N
Show solution
Solution
According to Newton's first law, an object in uniform motion has a net force of 0 N acting on it.
Correct Answer:
A
— 0 N
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Q. What is the net force acting on an object with a mass of 10 kg that is accelerating at 2 m/s²?
A.
5 N
B.
10 N
C.
20 N
D.
15 N
Show solution
Solution
Net force is calculated using F = ma. Here, F = 10 kg * 2 m/s² = 20 N.
Correct Answer:
C
— 20 N
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Q. What is the phase constant in simple harmonic motion?
A.
It determines the amplitude
B.
It determines the frequency
C.
It determines the initial position and direction
D.
It has no effect
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Solution
The phase constant φ determines the initial position and direction of the motion in simple harmonic motion.
Correct Answer:
C
— It determines the initial position and direction
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Q. What is the photoelectric effect in the context of semiconductors?
A.
Emission of electrons when light hits a material
B.
Absorption of light by electrons
C.
Reflection of light from a surface
D.
Transmission of light through a material
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Solution
The photoelectric effect refers to the emission of electrons from a material when it is exposed to light, which is a fundamental principle in semiconductor devices like photodiodes.
Correct Answer:
A
— Emission of electrons when light hits a material
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Q. What is the photoelectric effect primarily evidence for?
A.
The wave nature of light
B.
The particle nature of light
C.
The dual nature of light
D.
The electromagnetic spectrum
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Solution
The photoelectric effect provides evidence for the particle nature of light, as it demonstrates that light can be thought of as consisting of discrete packets of energy called photons.
Correct Answer:
B
— The particle nature of light
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Q. What is the photoelectric effect primarily evidence of?
A.
Wave nature of light
B.
Particle nature of light
C.
Thermal energy transfer
D.
Chemical reactions
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Solution
The photoelectric effect is primarily evidence of the particle nature of light, as it demonstrates that light can be thought of as consisting of discrete packets of energy called photons.
Correct Answer:
B
— Particle nature of light
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Q. What is the potential difference (V) across a capacitor after it has been fully charged in an RC circuit?
A.
V = 0
B.
V = V0
C.
V = R * I
D.
V = C * I
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Solution
After a capacitor is fully charged in an RC circuit, the potential difference across it is equal to the source voltage V = V0.
Correct Answer:
B
— V = V0
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Q. What is the potential difference across a 10 µF capacitor charged to 5 V?
A.
0.05 J
B.
0.05 C
C.
0.05 V
D.
0.05 F
Show solution
Solution
The potential difference is simply the voltage, which is 5 V.
Correct Answer:
C
— 0.05 V
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