Q. In a game, the probability of winning is 0.25. If a player plays 4 times, what is the probability of winning at least once?
A.
0.75
B.
0.84
C.
0.93
D.
0.99
Solution
The probability of losing all 4 games is (0.75)^4 = 0.3164. Therefore, the probability of winning at least once is 1 - 0.3164 = 0.6836, approximately 0.84.
Q. In a gas mixture, which law can be used to find the total pressure exerted by the gases?
A.
Dalton's Law of Partial Pressures
B.
Boyle's Law
C.
Charles's Law
D.
Ideal Gas Law
Solution
Dalton's Law of Partial Pressures states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each gas.
Correct Answer:
A
— Dalton's Law of Partial Pressures
Q. In a gas, the mean free path is defined as the average distance traveled by a molecule between collisions. Which factor does NOT affect the mean free path?
A.
Temperature
B.
Pressure
C.
Molecular diameter
D.
Color of the gas
Solution
The mean free path is affected by temperature, pressure, and molecular diameter, but not by the color of the gas.
Q. In a generator, mechanical energy is converted into electrical energy through the principle of:
A.
Electrostatics
B.
Electromagnetic induction
C.
Thermodynamics
D.
Optics
Solution
In a generator, mechanical energy is converted into electrical energy through the principle of electromagnetic induction, as the motion of conductors in a magnetic field induces an EMF.
Q. In a generator, what is the role of the rotating coil in a magnetic field?
A.
To create a magnetic field
B.
To induce current
C.
To store energy
D.
To measure voltage
Solution
In a generator, the rotating coil in a magnetic field induces current through electromagnetic induction, converting mechanical energy into electrical energy.
Q. In a genetic experiment, a plant with genotype AaBb is crossed with another plant of genotype Aabb. What is the probability of obtaining an offspring with genotype Aabb?
A.
1/4
B.
1/2
C.
3/4
D.
1/8
Solution
The possible genotypes from the cross AaBb x Aabb are AaBb, Aabb, AABb, and Aabb. The probability of Aabb is 1/2.
Q. In a genetic study, if a trait is controlled by a single gene with two alleles, how many different genotypes can be formed from two heterozygous parents?
A.
1
B.
2
C.
3
D.
4
Solution
From two heterozygous parents (Aa x Aa), the possible genotypes are AA, Aa, and aa, resulting in 3 different genotypes.
Q. In a genetic study, if a trait is controlled by a single gene with two alleles, where one allele is completely dominant over the other, what is the expected genotypic ratio in the offspring of a monohybrid cross?
A.
1:2:1
B.
3:1
C.
1:1
D.
9:3:3:1
Solution
The expected genotypic ratio from a monohybrid cross is 1:2:1.
Q. In a genetic study, if a trait is controlled by a single gene with two alleles, where one allele is completely dominant over the other, what type of inheritance pattern is this?
A.
Codominance
B.
Incomplete dominance
C.
Complete dominance
D.
Polygenic inheritance
Solution
This describes complete dominance, where one allele completely masks the effect of the other.
