Physics Syllabus (JEE Main)
Q. In a single-slit diffraction experiment, what happens to the width of the central maximum as the slit width decreases?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
As the slit width decreases, the central maximum becomes wider due to increased diffraction.
Correct Answer: A — It increases
Learn More →
Q. In a single-slit diffraction pattern, how does the intensity of the central maximum compare to the first minimum?
A.
Equal
B.
Twice
C.
Four times
D.
Half
Show solution
Solution
The intensity of the central maximum is four times that of the first minimum in a single-slit diffraction pattern.
Correct Answer: C — Four times
Learn More →
Q. In a single-slit diffraction pattern, how does the intensity of the first minimum compare to the intensity of the central maximum?
A.
It is equal
B.
It is half
C.
It is zero
D.
It is one-fourth
Show solution
Solution
The intensity at the first minimum is zero, while the central maximum has maximum intensity.
Correct Answer: C — It is zero
Learn More →
Q. In a single-slit diffraction pattern, how many minima are there on either side of the central maximum?
A.
One
B.
Two
C.
Three
D.
Infinite
Show solution
Solution
In a single-slit diffraction pattern, there are theoretically infinite minima on either side of the central maximum.
Correct Answer: D — Infinite
Learn More →
Q. In a single-slit diffraction pattern, the width of the central maximum is 4 mm. If the slit width is halved, what will be the new width of the central maximum?
A.
2 mm
B.
4 mm
C.
8 mm
D.
16 mm
Show solution
Solution
The width of the central maximum is inversely proportional to the slit width. Halving the slit width doubles the width of the central maximum to 8 mm.
Correct Answer: C — 8 mm
Learn More →
Q. In a single-slit diffraction pattern, what is the angle for the first minimum if the slit width is 0.5 mm and the wavelength of light is 600 nm?
A.
30°
B.
60°
C.
45°
D.
15°
Show solution
Solution
For single-slit diffraction, the first minimum occurs at sin θ = λ/a. Here, sin θ = 600 x 10^-9 m / 0.5 x 10^-3 m = 0.0012, θ ≈ 0.0698 rad ≈ 4°.
Correct Answer: C — 45°
Learn More →
Q. In a single-slit diffraction pattern, what is the angle for the first minimum?
A.
sin(θ) = λ/a
B.
sin(θ) = 2λ/a
C.
sin(θ) = 3λ/a
D.
sin(θ) = 0
Show solution
Solution
The angle for the first minimum in single-slit diffraction is given by sin(θ) = λ/a, where a is the slit width.
Correct Answer: A — sin(θ) = λ/a
Learn More →
Q. In a single-slit diffraction pattern, what is the angular position of the first minimum?
A.
sin(θ) = λ/a
B.
sin(θ) = 2λ/a
C.
sin(θ) = 3λ/a
D.
sin(θ) = 0
Show solution
Solution
The first minimum in a single-slit diffraction pattern occurs at sin(θ) = λ/a, where a is the width of the slit.
Correct Answer: A — sin(θ) = λ/a
Learn More →
Q. In a single-slit diffraction pattern, what is the angular width of the central maximum if the slit width is 0.5 mm and light of wavelength 500 nm is used?
A.
0.1 rad
B.
0.2 rad
C.
0.3 rad
D.
0.4 rad
Show solution
Solution
Angular width = 2λ/a = 2(500 nm)/(0.5 mm) = 2(500 x 10^-9)/(0.5 x 10^-3) = 0.002 rad.
Correct Answer: B — 0.2 rad
Learn More →
Q. In a single-slit diffraction pattern, what is the angular width of the central maximum if the slit width is 0.5 mm and the wavelength of light is 500 nm?
A.
0.1 rad
B.
0.2 rad
C.
0.3 rad
D.
0.4 rad
Show solution
Solution
Angular width = 2λ/a. Here, a = 0.5 mm = 500 μm, so angular width = 2 * 500 nm / 500 μm = 0.002 rad = 0.2 rad.
Correct Answer: B — 0.2 rad
Learn More →
Q. In a single-slit diffraction pattern, where is the first minimum located?
A.
At θ = 0
B.
At θ = λ/a
C.
At θ = a/λ
D.
At θ = 2λ/a
Show solution
Solution
The first minimum in a single-slit diffraction pattern occurs at θ = λ/a, where a is the width of the slit.
Correct Answer: B — At θ = λ/a
Learn More →
Q. In a situation where two parallel wires carry currents in the same direction, what is the nature of the force between them?
A.
Attractive
B.
Repulsive
C.
No force
D.
Depends on the distance
Show solution
Solution
Two parallel wires carrying currents in the same direction experience an attractive force between them.
Correct Answer: A — Attractive
Learn More →
Q. In a solenoid carrying current, the magnetic field inside the solenoid is:
A.
Zero
B.
Uniform and directed along the axis
C.
Non-uniform and directed radially
D.
Variable and depends on the distance from the center
Show solution
Solution
Inside a long solenoid, the magnetic field is uniform and directed along the axis of the solenoid.
Correct Answer: B — Uniform and directed along the axis
Learn More →
Q. In a solenoid carrying current, what is the direction of the magnetic field inside the solenoid?
A.
Perpendicular to the axis of the solenoid
B.
Along the axis of the solenoid
C.
Radially outward from the solenoid
D.
Zero inside the solenoid
Show solution
Solution
The magnetic field inside a solenoid is uniform and directed along the axis of the solenoid.
Correct Answer: B — Along the axis of the solenoid
Learn More →
Q. In a solenoid carrying current, what is the direction of the magnetic field inside the solenoid according to Ampere's Law?
A.
From south to north
B.
From north to south
C.
Perpendicular to the axis
D.
Radially outward
Show solution
Solution
The magnetic field inside a solenoid is directed from the north pole to the south pole of the solenoid.
Correct Answer: B — From north to south
Learn More →
Q. In a solenoid carrying current, what is the magnetic field inside the solenoid?
A.
Zero
B.
μ₀nI
C.
μ₀I
D.
μ₀I/(2n)
Show solution
Solution
The magnetic field inside a solenoid carrying current is given by B = μ₀nI, where n is the number of turns per unit length.
Correct Answer: B — μ₀nI
Learn More →
Q. In a solenoid, if the number of turns per unit length is doubled, what happens to the magnetic field inside the solenoid?
A.
It doubles
B.
It remains the same
C.
It halves
D.
It quadruples
Show solution
Solution
The magnetic field inside a solenoid is directly proportional to the number of turns per unit length, so it doubles.
Correct Answer: A — It doubles
Learn More →
Q. In a solenoid, what factor does NOT affect the strength of the magnetic field inside it?
A.
Number of turns per unit length
B.
Current through the solenoid
C.
Length of the solenoid
D.
Permeability of the core material
Show solution
Solution
The length of the solenoid does not affect the strength of the magnetic field inside it; it is determined by the number of turns per unit length, the current, and the permeability of the core material.
Correct Answer: C — Length of the solenoid
Learn More →
Q. In a solenoid, what happens to the magnetic field strength if the number of turns is doubled while keeping the current constant?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the number of turns per unit length, so doubling the turns doubles the magnetic field strength.
Correct Answer: A — It doubles
Learn More →
Q. In a solenoid, what is the effect of increasing the number of turns per unit length on the magnetic field strength?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Increasing the number of turns per unit length in a solenoid increases the magnetic field strength.
Correct Answer: A — Increases
Learn More →
Q. In a solenoid, what is the expression for the magnetic field inside it when it carries a current I?
A.
B = μ₀nI
B.
B = μ₀I/2πr
C.
B = μ₀I/4πr²
D.
B = μ₀I/n
Show solution
Solution
Inside a long solenoid, the magnetic field is given by B = μ₀nI, where n is the number of turns per unit length.
Correct Answer: A — B = μ₀nI
Learn More →
Q. In a standing wave, the points of maximum displacement are called:
A.
Nodes
B.
Antinodes
C.
Crests
D.
Troughs
Show solution
Solution
In a standing wave, the points of maximum displacement are called antinodes, while nodes are points of zero displacement.
Correct Answer: B — Antinodes
Learn More →
Q. In a standing wave, what is the distance between two consecutive nodes?
Show solution
Solution
The distance between two consecutive nodes in a standing wave is λ/2.
Correct Answer: A — λ/2
Learn More →
Q. In a standing wave, what is the point called where there is no displacement?
A.
Node
B.
Antinode
C.
Crest
D.
Trough
Show solution
Solution
A node is a point in a standing wave where the displacement is always zero.
Correct Answer: A — Node
Learn More →
Q. In a standing wave, what is the position of the nodes?
A.
Points of maximum amplitude
B.
Points of minimum amplitude
C.
Points of zero displacement
D.
Points of maximum energy
Show solution
Solution
Nodes in a standing wave are points where there is no displacement, meaning they are points of minimum amplitude.
Correct Answer: C — Points of zero displacement
Learn More →
Q. In a standing wave, what is the relationship between the nodes and antinodes?
A.
Nodes are points of maximum amplitude
B.
Antinodes are points of zero amplitude
C.
Nodes are points of zero amplitude
D.
Antinodes are points of minimum amplitude
Show solution
Solution
In a standing wave, nodes are points of zero amplitude, while antinodes are points of maximum amplitude.
Correct Answer: C — Nodes are points of zero amplitude
Learn More →
Q. In a system of two particles, if one particle has an angular momentum of L1 and the other has L2, what is the total angular momentum of the system?
A.
L1 + L2
B.
L1 - L2
C.
L1 * L2
D.
L1 / L2
Show solution
Solution
Total angular momentum of the system is the vector sum of individual angular momenta: L_total = L1 + L2.
Correct Answer: A — L1 + L2
Learn More →
Q. In a system of two rotating bodies, if one body has twice the moment of inertia of the other, how does their angular momentum compare if they rotate with the same angular velocity?
A.
The same
B.
Twice as much
C.
Half as much
D.
Four times as much
Show solution
Solution
Angular momentum L = Iω; if one has twice the moment of inertia, it will have twice the angular momentum at the same angular velocity.
Correct Answer: B — Twice as much
Learn More →
Q. In a system of two rotating disks, if disk A has twice the moment of inertia of disk B and they are both rotating with the same angular velocity, what can be said about their angular momentum?
A.
LA = LB
B.
LA = 2LB
C.
LA = 4LB
D.
LA = 1/2 LB
Show solution
Solution
Angular momentum L = Iω; since IA = 2IB and ωA = ωB, LA = 2LB.
Correct Answer: B — LA = 2LB
Learn More →
Q. In a temperature-resistivity graph, what does the slope represent for a metallic conductor?
A.
Resistivity
B.
Temperature coefficient of resistivity
C.
Resistance
D.
Conductivity
Show solution
Solution
The slope of the temperature-resistivity graph represents the temperature coefficient of resistivity.
Correct Answer: B — Temperature coefficient of resistivity
Learn More →
Showing 2731 to 2760 of 5000 (167 Pages)