Q. In a circuit with a 24V battery and a total resistance of 8Ω, what is the power consumed by the circuit? (2023)
A.
72 W
B.
48 W
C.
36 W
D.
24 W
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Solution
Power P = V^2/R = 24^2/8 = 576/8 = 72 W.
Correct Answer:
B
— 48 W
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Q. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the current flowing through the circuit? (2022)
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Solution
Total resistance R = 3Ω + 6Ω = 9Ω. Current I = V/R = 9V/9Ω = 1A.
Correct Answer:
B
— 2A
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Q. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the voltage across the 6Ω resistor? (2022)
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Solution
Total resistance R_total = 3Ω + 6Ω = 9Ω. Current I = V/R_total = 9V/9Ω = 1A. Voltage across 6Ω = I * R = 1A * 6Ω = 6V.
Correct Answer:
B
— 6V
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Q. In a circuit with a voltage of 24V and a current of 6A, what is the resistance? (2020)
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Solution
Using Ohm's Law, R = V/I = 24V / 6A = 4Ω.
Correct Answer:
D
— 8Ω
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Q. In a circuit with an inductor, what happens to the current when the voltage is suddenly increased? (2020)
A.
Increases immediately
B.
Decreases immediately
C.
Increases gradually
D.
Decreases gradually
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Solution
In a circuit with an inductor, the current increases gradually due to the inductor's opposition to changes in current.
Correct Answer:
C
— Increases gradually
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Q. In a circuit, if the current is 5A and the resistance is 10Ω, what is the voltage across the resistor? (2021)
A.
15V
B.
50V
C.
5V
D.
10V
Show solution
Solution
Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.
Correct Answer:
B
— 50V
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Q. In a circuit, if the current is 5A and the resistance is 10Ω, what is the voltage? (2020)
A.
15V
B.
50V
C.
5V
D.
10V
Show solution
Solution
Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.
Correct Answer:
B
— 50V
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Q. In a circuit, if the resistance is doubled while the voltage remains constant, what happens to the current? (2021)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to Ohm's law, I = V/R. If R is doubled, I will be halved.
Correct Answer:
B
— It halves
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Q. In a circuit, if the voltage is 24V and the current is 3A, what is the resistance? (2023)
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Solution
Using Ohm's Law, R = V / I = 24V / 3A = 8Ω.
Correct Answer:
B
— 6Ω
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Q. In a circuit, if the voltage is tripled and the resistance remains constant, what happens to the current? (2022)
A.
It triples
B.
It halves
C.
It remains the same
D.
It doubles
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Solution
According to Ohm's law, if V is tripled, I will also triple.
Correct Answer:
A
— It triples
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Q. In a closed system, if a reactant is removed from the equilibrium mixture, what will happen? (2019)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
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Solution
Removing a reactant will shift the equilibrium to the left to produce more reactants, according to Le Chatelier's principle.
Correct Answer:
B
— Shift to the left
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Q. In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)
A.
Heat is added and work is done on the system
B.
Heat is removed and work is done by the system
C.
Heat is added and work is done by the system
D.
No heat exchange occurs
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Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that heat is added to the system and/or work is done on the system.
Correct Answer:
A
— Heat is added and work is done on the system
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Q. In a closed system, if the internal energy increases, what can be said about the work done and heat added? (2020)
A.
Work done is positive and heat added is negative
B.
Work done is negative and heat added is positive
C.
Both work done and heat added are positive
D.
Both work done and heat added are negative
Show solution
Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that either work is done on the system or heat is added to the system.
Correct Answer:
C
— Both work done and heat added are positive
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Q. In a concave lens, the focal length is always: (2020)
A.
Positive
B.
Negative
C.
Zero
D.
Infinite
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Solution
The focal length of a concave lens is always negative, as it diverges light rays.
Correct Answer:
B
— Negative
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Q. In a concave lens, the focal length is considered to be: (2023)
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
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Solution
The focal length of a concave lens is considered negative as it diverges light rays.
Correct Answer:
B
— Negative
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Q. In a concave lens, the focal length is: (2023)
A.
Positive
B.
Negative
C.
Zero
D.
Infinite
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Solution
The focal length of a concave lens is negative, indicating that it diverges light rays.
Correct Answer:
B
— Negative
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Q. In a concentration cell, the electrodes are made of: (2020)
A.
Different metals
B.
Same metal but different concentrations
C.
Same metal and same concentration
D.
Different electrolytes
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Solution
In a concentration cell, the electrodes are made of the same metal but have different concentrations of the electrolyte.
Correct Answer:
B
— Same metal but different concentrations
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Q. In a concentration cell, the two half-cells have: (2019)
A.
Different electrodes
B.
Same electrodes but different concentrations
C.
Same concentrations
D.
Different temperatures
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Solution
In a concentration cell, the two half-cells have the same electrodes but different concentrations of the electrolyte.
Correct Answer:
B
— Same electrodes but different concentrations
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Q. In a convex lens, if the object is placed at the focus, what type of image is formed? (2020)
A.
Real and inverted
B.
Virtual and upright
C.
Real and upright
D.
No image is formed
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Solution
When the object is placed at the focus of a convex lens, the rays of light emerge parallel and no image is formed.
Correct Answer:
D
— No image is formed
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Q. In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what will be the genotype of the F1 generation? (2019)
A.
TT
B.
tt
C.
Tt
D.
TtTt
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Solution
The genotype of the F1 generation from a cross between TT and tt will be Tt (all offspring will be heterozygous).
Correct Answer:
C
— Tt
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Q. In a cross between a homozygous tall plant and a homozygous short plant, what will be the height of the F1 generation? (2019)
A.
Tall
B.
Short
C.
Medium
D.
Variable
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Solution
The height of the F1 generation will be tall, as tall is the dominant trait.
Correct Answer:
A
— Tall
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Q. In a cross between a red flowered plant (RR) and a white flowered plant (rr), what will be the color of the flowers in the F1 generation? (2019)
A.
Red
B.
White
C.
Pink
D.
Purple
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Solution
The F1 generation will have red flowers since red is dominant over white.
Correct Answer:
A
— Red
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Q. In a crystal lattice, the arrangement of particles is determined by which of the following? (2019)
A.
Temperature
B.
Pressure
C.
Intermolecular forces
D.
All of the above
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Solution
The arrangement of particles in a crystal lattice is primarily determined by intermolecular forces, which dictate how particles pack together.
Correct Answer:
C
— Intermolecular forces
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Q. In a diffraction pattern produced by a single slit, what happens to the central maximum when the slit width is decreased? (2022)
A.
It becomes narrower
B.
It becomes wider
C.
It disappears
D.
It remains the same
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Solution
Decreasing the slit width increases the diffraction angle, causing the central maximum to become wider.
Correct Answer:
B
— It becomes wider
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Q. In a dihybrid cross, what is the expected phenotypic ratio? (2023)
A.
1:1
B.
3:1
C.
9:3:3:1
D.
1:2:1
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Solution
The expected phenotypic ratio in a dihybrid cross is 9:3:3:1.
Correct Answer:
C
— 9:3:3:1
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Q. In a double convex lens, if the focal length is 15 cm, what is the power of the lens? (2022)
A.
+6.67 D
B.
+7.5 D
C.
+10 D
D.
+15 D
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Solution
Power (P) of a lens is given by P = 1/f (in meters). Here, f = 15 cm = 0.15 m, so P = 1/0.15 = +6.67 D.
Correct Answer:
B
— +7.5 D
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Q. In a double-slit experiment, if the distance between the slits is increased, what happens to the distance between the interference fringes? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The distance between the fringes decreases as fringe width β = λD/d; increasing d reduces β.
Correct Answer:
B
— Decreases
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Q. In a double-slit experiment, if the distance between the slits is increased, what happens to the position of the interference fringes? (2020)
A.
Fringes move closer together
B.
Fringes move further apart
C.
Fringes disappear
D.
Fringes remain unchanged
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Solution
Increasing the slit separation d decreases the fringe width, causing the fringes to move closer together.
Correct Answer:
A
— Fringes move closer together
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Q. In a double-slit experiment, if the light source is changed from monochromatic to polychromatic, what happens to the interference pattern? (2019)
A.
Pattern becomes sharper
B.
Pattern becomes broader
C.
Pattern disappears
D.
Pattern remains unchanged
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Solution
Using polychromatic light results in overlapping patterns of different wavelengths, causing the overall pattern to become broader.
Correct Answer:
B
— Pattern becomes broader
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Q. In a double-slit experiment, if the screen is moved further away from the slits, what happens to the fringe separation? (2019)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Moving the screen further away increases the fringe separation, as fringe width β = λD/d; increasing D increases β.
Correct Answer:
A
— Increases
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