Q. What happens to the current in a circuit if the voltage is increased while keeping the resistance constant? (2023)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Ohm's Law, if the voltage increases while resistance remains constant, the current will also increase.
Correct Answer: B — It increases
Learn More →
Q. What happens to the current in a circuit if the voltage is increased while the resistance remains constant? (2021)
A.
The current decreases
B.
The current increases
C.
The current remains the same
D.
The current becomes zero
Show solution
Solution
According to Ohm's Law, if the voltage (V) increases while resistance (R) remains constant, the current (I) will increase.
Correct Answer: B — The current increases
Learn More →
Q. What happens to the current in a circuit if the voltage is tripled while the resistance remains constant? (2023)
A.
It triples.
B.
It halves.
C.
It remains the same.
D.
It increases by a factor of nine.
Show solution
Solution
According to Ohm's Law, if the voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple (I = V/R).
Correct Answer: A — It triples.
Learn More →
Q. What happens to the current in a parallel circuit if one branch is removed? (2019)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current stops
Show solution
Solution
In a parallel circuit, removing one branch does not affect the current in the other branches.
Correct Answer: C — Current remains the same
Learn More →
Q. What happens to the current in a series circuit if one of the components fails? (2019)
A.
Current increases
B.
Current decreases
C.
Current stops
D.
Current remains the same
Show solution
Solution
In a series circuit, if one component fails, the current stops flowing through the entire circuit.
Correct Answer: C — Current stops
Learn More →
Q. What happens to the density of a material when it is compressed? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Density increases when a material is compressed, as mass remains constant while volume decreases.
Correct Answer: B — It increases
Learn More →
Q. What happens to the electric field when the charge is doubled while keeping the distance constant? (2023)
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
Show solution
Solution
The electric field E is directly proportional to the charge, so if the charge is doubled, the electric field also doubles.
Correct Answer: A — It doubles
Learn More →
Q. What happens to the equilibrium constant when a reaction is multiplied by a factor? (2023)
A.
It remains the same
B.
It is multiplied by the factor
C.
It is raised to the power of the factor
D.
It is divided by the factor
Show solution
Solution
When a balanced equation is multiplied by a factor, the equilibrium constant is raised to the power of that factor.
Correct Answer: C — It is raised to the power of the factor
Learn More →
Q. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
A.
Shifts to the right
B.
Shifts to the left
C.
No change
D.
Increases Kc
Show solution
Solution
A catalyst speeds up both the forward and reverse reactions equally, thus it does not change the position of equilibrium or the value of Kc.
Correct Answer: C — No change
Learn More →
Q. What happens to the image distance when the object distance is increased in a convex lens? (2022)
A.
Image distance decreases
B.
Image distance increases
C.
Image distance remains the same
D.
Image distance becomes negative
Show solution
Solution
As the object distance increases in a convex lens, the image distance also increases, moving further away from the lens.
Correct Answer: B — Image distance increases
Learn More →
Q. What happens to the image distance when the object is moved closer to a concave mirror? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes negative
Show solution
Solution
As the object moves closer to a concave mirror, the image distance increases, and the image becomes larger and more distant.
Correct Answer: A — Increases
Learn More →
Q. What happens to the image formed by a convex lens when the object is placed at a distance greater than twice the focal length? (2022)
A.
Virtual and erect
B.
Real and inverted
C.
Real and erect
D.
Virtual and inverted
Show solution
Solution
When the object is placed beyond twice the focal length, the image formed is real, inverted, and smaller than the object.
Correct Answer: B — Real and inverted
Learn More →
Q. What happens to the image when an object is moved closer to a convex lens than its focal length? (2019)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
Show solution
Solution
When the object is placed within the focal length of a convex lens, the image formed is virtual and erect.
Correct Answer: B — Virtual and erect
Learn More →
Q. What happens to the induced EMF if the speed of the magnet moving through a coil is doubled? (2022)
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
Show solution
Solution
The induced EMF doubles if the speed of the magnet moving through the coil is doubled.
Correct Answer: B — It doubles
Learn More →
Q. What happens to the induced emf when the rate of change of magnetic flux increases? (2019)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
The induced emf increases when the rate of change of magnetic flux increases, according to Faraday's Law.
Correct Answer: A — Increases
Learn More →
Q. What happens to the magnetic field inside a solenoid when the current is increased? (2020)
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
Show solution
Solution
The magnetic field inside a solenoid is directly proportional to the current. Therefore, if the current is increased, the magnetic field also increases.
Correct Answer: C — It increases
Learn More →
Q. What happens to the magnetic field strength inside a long solenoid if the current is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, doubling the current will double the magnetic field strength.
Correct Answer: B — It doubles
Learn More →
Q. What happens to the magnetic field strength inside a solenoid if the current is increased? (2021)
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it.
Correct Answer: C — It increases
Learn More →
Q. What happens to the magnetic field strength inside a solenoid if the current through it is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, if the current is doubled, the magnetic field strength also doubles.
Correct Answer: B — It doubles
Learn More →
Q. What happens to the magnetic field when the direction of current in a wire is reversed? (2023)
A.
The magnetic field remains unchanged
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
Show solution
Solution
Reversing the direction of current in a wire reverses the direction of the magnetic field around it.
Correct Answer: B — The magnetic field direction reverses
Learn More →
Q. What happens to the resistance of a semiconductor as it is illuminated? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the resistance of a semiconductor as temperature increases? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the resistance of a semiconductor with an increase in temperature? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the shear modulus if the shear stress is doubled while keeping the shear strain constant? (2019)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Shear modulus (G) is defined as shear stress divided by shear strain. If shear strain is constant, doubling shear stress does not change G.
Correct Answer: C — It remains the same
Learn More →
Q. What happens to the speed of light as it passes from air into water? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The speed of light decreases when it passes from a less dense medium (air) to a denser medium (water).
Correct Answer: B — Decreases
Learn More →
Q. What happens to the total current in a parallel circuit if one branch is disconnected? (2023)
A.
Total current increases
B.
Total current decreases
C.
Total current remains the same
D.
Total current becomes zero
Show solution
Solution
In a parallel circuit, if one branch is disconnected, the total current decreases.
Correct Answer: B — Total current decreases
Learn More →
Q. What happens to the total current in a parallel circuit when more branches are added? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In a parallel circuit, adding more branches increases the total current.
Correct Answer: B — It increases
Learn More →
Q. What happens to the total current in a parallel RLC circuit at resonance? (2022)
A.
It is maximum
B.
It is minimum
C.
It is zero
D.
It is constant
Show solution
Solution
At resonance in a parallel RLC circuit, the total current is maximum because the impedance is at its minimum.
Correct Answer: A — It is maximum
Learn More →
Q. What happens to the total resistance in a parallel circuit when more resistors are added? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes infinite
Show solution
Solution
In a parallel circuit, adding more resistors decreases the total resistance because the total resistance is given by 1/R_total = 1/R1 + 1/R2 + ...
Correct Answer: B — It decreases
Learn More →
Q. What happens to the volume of a material when it is subjected to uniform pressure? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It depends on the material
Show solution
Solution
Uniform pressure typically causes a decrease in volume, known as compression.
Correct Answer: B — It decreases
Learn More →
Showing 601 to 630 of 2614 (88 Pages)