Q. What happens to the viscosity of a gas as temperature increases?
A.
Viscosity decreases
B.
Viscosity increases
C.
Viscosity remains constant
D.
Viscosity fluctuates
Show solution
Solution
For gases, viscosity increases with an increase in temperature due to increased molecular activity and collisions.
Correct Answer: B — Viscosity increases
Learn More →
Q. What happens to the viscosity of a liquid as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies unpredictably
Show solution
Solution
As temperature increases, the viscosity of a liquid generally decreases because the increased thermal energy allows the molecules to move more freely.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the viscosity of gases with an increase in temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies randomly
Show solution
Solution
The viscosity of gases increases with an increase in temperature due to increased molecular motion.
Correct Answer: A — Increases
Learn More →
Q. What happens to the voltage across a capacitor when it is fully charged?
A.
It becomes zero
B.
It equals the supply voltage
C.
It becomes negative
D.
It fluctuates
Show solution
Solution
When a capacitor is fully charged, the voltage across it equals the supply voltage.
Correct Answer: B — It equals the supply voltage
Learn More →
Q. What happens to the volume of a gas if its temperature is increased at constant pressure?
A.
It decreases
B.
It increases
C.
It remains constant
D.
It becomes zero
Show solution
Solution
According to Charles's Law, at constant pressure, the volume of a gas increases with an increase in temperature.
Correct Answer: B — It increases
Learn More →
Q. What happens to the volume of a gas if the temperature is increased at constant pressure?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Charles's law, the volume of a gas increases with an increase in temperature at constant pressure.
Correct Answer: B — It increases
Learn More →
Q. What happens to the volume of a gas when its temperature is increased at constant pressure?
A.
It decreases
B.
It increases
C.
It remains constant
D.
It becomes zero
Show solution
Solution
According to Charles's Law, the volume of a gas increases with an increase in temperature at constant pressure.
Correct Answer: B — It increases
Learn More →
Q. What happens to the volume of a gas when the pressure is increased at constant temperature?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
According to Boyle's Law, the volume of a gas decreases when pressure increases at constant temperature.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the weight of an object when it is taken to a height equal to the radius of the Earth?
A.
It becomes zero
B.
It is halved
C.
It is doubled
D.
It remains the same
Show solution
Solution
At a height equal to the radius of the Earth, the weight is halved due to the inverse square law of gravitation.
Correct Answer: B — It is halved
Learn More →
Q. What happens to the Young's modulus of a material as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
Generally, the Young's modulus of materials decreases with an increase in temperature.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the Young's modulus of a material when it is heated?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
Show solution
Solution
Generally, the Young's modulus of a material decreases when it is heated due to increased atomic vibrations.
Correct Answer: B — It decreases
Learn More →
Q. What is Brewster's angle for a medium with a refractive index of 1.5?
A.
30 degrees
B.
45 degrees
C.
60 degrees
D.
53 degrees
Show solution
Solution
Brewster's angle can be calculated using the formula tan(θ) = n, which gives approximately 53 degrees for n = 1.5.
Correct Answer: D — 53 degrees
Learn More →
Q. What is Brewster's angle?
A.
The angle at which light is completely absorbed
B.
The angle at which light is reflected with maximum polarization
C.
The angle at which light refracts without any reflection
D.
The angle at which light travels fastest
Show solution
Solution
Brewster's angle is the angle of incidence at which light is reflected with maximum polarization.
Correct Answer: B — The angle at which light is reflected with maximum polarization
Learn More →
Q. What is denaturation of proteins?
A.
The process of protein synthesis
B.
The loss of protein function due to structural changes
C.
The formation of peptide bonds
D.
The folding of proteins into their functional shape
Show solution
Solution
Denaturation refers to the process where proteins lose their native structure and function due to external factors like heat or pH changes.
Correct Answer: B — The loss of protein function due to structural changes
Learn More →
A.
The direction of induced current opposes the change in magnetic flux
B.
The induced current flows in the same direction as the change in magnetic flux
C.
The induced EMF is always positive
D.
The magnetic field is always perpendicular to the current
Show solution
Solution
Lenz's law states that the direction of induced current is such that it opposes the change in magnetic flux that produced it.
Correct Answer: A — The direction of induced current opposes the change in magnetic flux
Learn More →
Q. What is Poisson's ratio?
A.
Lateral strain/Longitudinal strain
B.
Longitudinal strain/Lateral strain
C.
Stress/Strain
D.
Strain/Stress
Show solution
Solution
Poisson's ratio (ν) is defined as the ratio of lateral strain to longitudinal strain.
Correct Answer: A — Lateral strain/Longitudinal strain
Learn More →
Q. What is Raoult's Law primarily used to describe?
A.
The behavior of ideal gases
B.
The vapor pressure of solutions
C.
The boiling point elevation
D.
The freezing point depression
Show solution
Solution
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent.
Correct Answer: B — The vapor pressure of solutions
Learn More →
Q. What is Raoult's Law primarily used to determine?
A.
Vapor pressure of a solution
B.
Boiling point elevation
C.
Freezing point depression
D.
Molarity of a solution
Show solution
Solution
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent.
Correct Answer: A — Vapor pressure of a solution
Learn More →
Q. What is self-inductance?
A.
The ability of a coil to induce EMF in itself
B.
The ability of a coil to induce EMF in another coil
C.
The resistance of a coil to current flow
D.
The capacitance of a coil
Show solution
Solution
Self-inductance is the property of a coil to induce an EMF in itself due to a change in current.
Correct Answer: A — The ability of a coil to induce EMF in itself
Learn More →
Q. What is self-induction?
A.
Induction of EMF in a coil due to its own changing current
B.
Induction of EMF in a coil due to an external magnetic field
C.
Induction of current in a conductor due to a magnetic field
D.
Induction of voltage in a capacitor
Show solution
Solution
Self-induction is the phenomenon where a changing current in a coil induces an EMF in the same coil.
Correct Answer: A — Induction of EMF in a coil due to its own changing current
Learn More →
Q. What is surface tension?
A.
Force per unit length
B.
Energy per unit area
C.
Pressure difference
D.
Viscosity of a liquid
Show solution
Solution
Surface tension is defined as the force acting along the surface of a liquid per unit length.
Correct Answer: A — Force per unit length
Learn More →
Q. What is the 75th percentile of the data set {10, 20, 30, 40, 50}?
Show solution
Solution
The 75th percentile (Q3) is the value below which 75% of the data falls, which is 40.
Correct Answer: A — 40
Learn More →
Q. What is the 7th term of the sequence defined by a_n = 2^n + 3^n?
A.
2187
B.
243
C.
256
D.
729
Show solution
Solution
a_7 = 2^7 + 3^7 = 128 + 2187 = 2315.
Correct Answer: A — 2187
Learn More →
Q. What is the acceleration due to gravity at a height equal to the radius of the Earth?
A.
g/2
B.
g/3
C.
g/4
D.
g/5
Show solution
Solution
At height equal to radius, g' = g / (1 + h/R)² = g / (2)² = g/4.
Correct Answer: C — g/4
Learn More →
Q. What is the acceleration of a rolling object down an incline if the incline angle is θ?
A.
g sin(θ)
B.
g sin(θ)/2
C.
g sin(θ)/3
D.
g sin(θ)/4
Show solution
Solution
The acceleration of a rolling object down an incline is given by g sin(θ)/2, considering both translational and rotational motion.
Correct Answer: B — g sin(θ)/2
Learn More →
Q. What is the angle between the lines 2x + 3y - 6 = 0 and 4x - y + 1 = 0?
A.
45 degrees
B.
60 degrees
C.
90 degrees
D.
30 degrees
Show solution
Solution
The slopes of the lines are -2/3 and 4. The angle θ can be found using tan(θ) = |(m1 - m2) / (1 + m1*m2)|.
Correct Answer: C — 90 degrees
Learn More →
Q. What is the angle between the lines represented by the equation 2x^2 + 3xy - 2y^2 = 0?
A.
45 degrees
B.
60 degrees
C.
90 degrees
D.
30 degrees
Show solution
Solution
Using the formula for the angle between two lines, we find that the angle is 90 degrees.
Correct Answer: C — 90 degrees
Learn More →
Q. What is the angle between the lines represented by the equation x^2 - 2xy + y^2 = 0?
A.
0 degrees
B.
45 degrees
C.
90 degrees
D.
135 degrees
Show solution
Solution
The angle can be calculated using the slopes derived from the equation, leading to 90 degrees.
Correct Answer: C — 90 degrees
Learn More →
Q. What is the angle between the lines represented by the equation x^2 - 6x + y^2 - 8y + 9 = 0?
A.
0 degrees
B.
45 degrees
C.
90 degrees
D.
135 degrees
Show solution
Solution
By completing the square, we can find the slopes of the lines and calculate the angle between them.
Correct Answer: C — 90 degrees
Learn More →
Q. What is the angle between the lines y = 2x + 1 and y = -0.5x + 3?
A.
90 degrees
B.
60 degrees
C.
45 degrees
D.
30 degrees
Show solution
Solution
The slopes are m1 = 2 and m2 = -0.5. The angle θ is given by tan(θ) = |(m1 - m2) / (1 + m1*m2)| = |(2 + 0.5) / (1 - 1)|, which is undefined, indicating 90 degrees.
Correct Answer: A — 90 degrees
Learn More →
Showing 6061 to 6090 of 10700 (357 Pages)