Science Practice Test

Which coefficient placed before NaNO₂ will balance this equation?

H₂SO₄ + NaNO₂ → 2HNO₂+ Na₂SO₄

Traits are inherited through genes, the memory banks of the cell. Every gene has two versions, called alleles. We use capital letters for dominant alleles (A) and lowercase for recessive alleles (a).

Read the scenario and the question.

In a certain plant species, the color pink (A) is dominant over the color yellow (a). According to the Punnett Square, what is the probability of an offspring being yellow?

Traits are inherited through genes, the memory banks of the cell. Every gene has two versions, called alleles. We use capital letters for dominant alleles (A) and lowercase for recessive alleles (a).

Read the scenario and the question.

In a certain plant species, the color yellow (A) is dominant over the color white (a). According to the Punnett Square, what is the probability of an offspring being yellow?

Which of the following is equivalent to V = IR?

The lines on the graph represent displacement vectors for the route along which a person moves.

What is the total distance traveled?

What is the solubility of potassium chloride in grams per 100 g of water at 60° C?

An object that travels 100 m in 20 s has what speed?

There are two types of twins – identical (monozygotic) and fraternal (dizygotic).

To form identical twins, one fertilized egg (ovum) splits and develops two babies with exactly the same genetic information. This differs from fraternal twins, where two eggs (ova) are fertilized by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times. Twins are more or less equally likely to be female or male.

Contrary to popular belief, the incidence of twins doesn’t skip generations.

Which of these is true?

Einstein made many great contributions to science, but he was best known for his Theory of Relativity.

This theory marked a turning point in how scientists view the world. It also laid the foundation for nuclear technologies like the nuclear bomb and nuclear energy.
A famous equation from Einstein’s Theory of Relativity (1916) is E=mc². In this formula, c represents the speed of light, which is a constant, and as far as we know the greatest speed in the universe. E stands for energy, and m stands for mass.

The Theory of Relativity explains that what we perceive as the force of gravity is actually a consequence of the curvature of space and time. Einstein proposed that when in the presence of matter and energy, the geometry of space-time can change, stretch, and warp, creating ridges, peaks, and troughs that make the bodies move through space-time zigzag and curve.

According to Einstein, then, there is no force of gravity. The Earth is not pulled towards the sun because of gravity, but because the geometry of space-time around the sun causes the Earth to move in that way. The General Theory of Relativity also describes the history and expansion of the universe, how black holes work, and the bending of light from distant stars and galaxies.

In the equation E=mc², what does the E stand for?

Einstein made many great contributions to science, but he was best known for his Theory of Relativity. This theory marked a turning point in how scientists view the world. It also laid the foundation for nuclear technologies like the nuclear bomb and nuclear energy.
A famous equation from Einstein’s Theory of Relativity (1916) is E=mc². In this formula, c represents the speed of light, which is a constant, and as far as we know the greatest speed in the universe. E stands for energy, and m stands for mass. The Theory of Relativity explains that what we perceive as the force of gravity is actually a consequence of the curvature of space and time.

Einstein proposed that when in the presence of matter and energy, the geometry of space-time can change, stretch, and warp, creating ridges, peaks, and troughs that make the bodies move through space-time zigzag and curve.

According to Einstein, then, there is no force of gravity. The Earth is not pulled towards the sun because of gravity, but because the geometry of space-time around the sun causes the Earth to move in that way. The General Theory of Relativity also describes the history and expansion of the universe, how black holes work, and the bending of light from distant stars and galaxies.

Which of the following does the Theory of Relativity NOT explain?

AVG company wants to test a new cat food that should help underweight cats become healthy quickly. 50 cats are given the food, and another 50 are left to eat like before. After one month the cats were checked to see if their weight was normal.

What is the dependent variable?

WTC company wants to test a new hamster food that should help underweight hamsters become healthy quickly. 50 hamsters are given the food, and another 50 are left to eat like before. After one month, the hamsters were checked to see if their weight was normal.

What is the control group?

Adam wants to study the effect of sunlight on plant growth. In his experiment, 12 plants receive normal amounts of sunlight, but half of them are also kept under bright sunlamps all night long. After 6 weeks, the plants’ heights are measured.

What is the experimental group?

Jerry is concerned about how tired his classmates seem. He created a drink that he thinks will boost their energy. He recruits 100 classmates with a history of tiredness.

He has 50 of them drink his new special energy drink. The other 50 drink a beverage that looks like the special energy drink, but is just water and food coloring.

Both groups were told that they were getting a special drink that would boost energy. After 2 hours, 30 classmates in the first group reported having more energy, and 8 classmates in the second group reported having more energy.

What is the independent variable?

Adam played 10 games last weekend. His scores are: 122, 185, 175, 148, 172, 168, 128, 156, 196, 199.

What is the range of his scores?

There are two types of twins – identical (monozygotic) and fraternal (dizygotic).

To form identical twins, one fertilized egg (ovum) splits and develops two babies with exactly the same genetic information. This differs from fraternal twins, where two eggs (ova) are fertilized by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times. Twins are more or less equally likely to be female or male.

Contrary to popular belief, the incidence of twins doesn’t skip generations.

At which stage in the lives of identical twins is the DNA code expected to be most similar?

Calculate the average speed of a bicycle that travels 100 m in 20 s.