Q: A 500 g sample of water is heated from $$20\ ^\circ \mathrm{C} to$$ $$80\ ^\circ \mathrm{C}. $$Given the specific heat capacity of water is $$c = 4186\ \mathrm{J}/\mathrm{kg}\cdot\mathrm{K}$$, how much heat is required?

$$Q = 0.5 \times 4186 \times 60 = 125,580\ \mathrm{J}$$

Question 1

Which of the following statements best describes 'absolute zero'?

Accepted Answer

It is the lowest possible temperature, where the average translational kinetic energy of particles is zero.

Question 2

A 500 g sample of water is heated from $$20\ ^\circ \mathrm{C} to$$ $$80\ ^\circ \mathrm{C}. $$Given the specific heat capacity of water is $$c = 4186\ \mathrm{J}/\mathrm{kg}\cdot\mathrm{K}$$, how much heat is required?

Accepted Answer

$$Q = 0.5 	imes 4186 	imes 60 = 125,580\ \mathrm{J}$$

Question 3

Why does the ocean maintain a relatively steady temperature throughout the year?

Accepted Answer

Because water has a high specific heat capacity, requiring more energy to change its temperature.

Question 4

Which of the following best explains why ice is less dense than liquid water?

Accepted Answer

Ice forms a crystalline structure with more open space, increasing its volume by about 10%.

Question 5

A metal rod is heated. What happens to its length and why?

Accepted Answer

The rod expands because the atoms vibrate more and move further apart.

Question 6

Which device is designed to inhibit conduction, convection, and radiation simultaneously?

Accepted Answer

A vacuum flask (thermos)

Question 7

According to Coulomb's Law, what is the force between two point charges $$q_1$$ and $$q_2$$ separated by distance $$r$$?

Accepted Answer

$$F = \frac{k q_1$ q_2$}{r^2$}$$

Question 8

Which of the following is a correct example of charging by induction?

Accepted Answer

Bringing a charged rod near a neutral metal sphere, grounding the sphere, then removing the ground and the rod.

Question 9

Which statement best describes the difference between electric and gravitational fields?

Accepted Answer

Electric fields can attract and repel, while gravitational fields only attract.

Question 10

A capacitor stores energy in which form?

Accepted Answer

Electric potential energy

Question 11

Which of the following best describes the relationship between wavelength $$\lambda$$ and frequency $$f of $$electromagnetic radiation?

Accepted Answer

$$\lambda$$ and $$f$$ are inversely proportional: $$c = \lambda f$$

Question 12

Which color of visible light corresponds to the highest frequency photon?

Accepted Answer

Blue

Question 13

During a solar eclipse, which type of shadow results in a total eclipse?

Accepted Answer

Umbra

Question 14

According to the photoelectric effect, which equation relates the energy of a photon to its frequency?

Accepted Answer

$$E = hf$$

Question 15

Which experiment demonstrated that most of the mass of an atom is concentrated in a small nucleus?

Accepted Answer

Rutherford's gold foil experiment

Question 16

What is the main idea behind the correspondence principle in physics?

Accepted Answer

New theories must agree with old theories in the domain where the old theories are valid.

Question 17

According to special relativity, what happens to the length of an object moving at a significant fraction of the speed of light?

Accepted Answer

Its length contracts in the direction of motion.

Question 18

A spaceship travels at $$0.8c$$ relative to Earth. What is the time dilation factor $$\gamma$$?

Accepted Answer

$$\gamma = \frac{1}{\sqrt{1 - (0.8)^2$}} = 1.67$$

Question 19

Which equation gives the relativistic momentum $$p of an $$object with mass $$m$$ moving at velocity $$v$$?

Accepted Answer

$$p = \frac{mv}{\sqrt{1 - \frac{v^2$}{c^2$}}}$$

Question 20

Which of the following is a real-world example of the greenhouse effect?

Accepted Answer

A car heating up in the sun with windows closed.

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