PHYSICS EOY TEST 24-25

Students are asked to investigate the ability of old batteries and new batteries to light multiple bulbs in parallel. Which hypothesis can lead to a valid experimental procedure providing information on the assignment?

• The new batteries will weigh more since they have more energy
• New batteries can pprovide more power than old ones
• Parallel bulbs will have the same voltage
• Bulbs in parallel will be brighter than those in series

2. Find the total resistance of the circuit shown. R1 = 4 ohms R2 = 6 ohms R3 = 6 ohms R4 = 8 ohms

Which of the following is equal at each point along this circuit?

• Current
• Potential
• Power
• Resistance

The pictures show four electrically charged items. If a student rubs a glass rod with a piece of silk, giving the rod a positive charge, which of the items will the rod attract?

• Balloon 1, only
• Plastic sheet 1, only
• Balloon 1 and plastic sheet 2
• Balloon 2 and plastic sheet 1

A student is asked to describe an example of a magnetic force in everyday life using an object found in the student's home. Which of the following objects would most likely be best for the student to use?

• a battery-operated toy car
• A table with a vase on top of it
• A refrigerator with objects stuck to the door
• A calculator powered by sunlight

Two electrons (-1.6x10^-19 C) are separated by an insulator at a distance of 0.10 mm. Which of the following is the electrostatic force between these electrons?

• +2.3 x 10 -20 N
• -2.3 x 10 -20 N
• + 2.8 x 10 -40 N
• -2.8 x 10 -40 N

A student creates identical electrical charges on identical balloons by rubbing them with a wool cloth. The balloons repel each other. According to Coulomb's Law, which should the student do to increase the electrical force of repulsion between these balloons?

• Increase the distance between the balloons
• Increase the charge on one of the balloons
• Increase the volume of one of the balloons
• Increase the masses of the balloons

An oceanographer is reviewing data in his scientific journal. He is analyzing the frequency of waves that hit the shoreline after a tropical storm. He noted that it took 2 seconds for two peaks of waves to pass the same point. What is wave frequency of the waves on the shoreline?

• 0.25 Hz
• 0.50 Hz
• 1.0 Hz
• 2.0 Hz

A “snaky spring” is a long elastic rope-like spring used to demonstrate wave properties. In a classroom demonstration, a student holds one end of the spring while the teacher oscillates the other end, producing waves of various shapes. Using the "snaky spring", a student plans to test the hypothesis that spring waves travel faster if the tension in the spring is higher. She proposed measuring the wavelength and frequency of several standing waves to find the speeds using the equation v = f λ. Which variable must she vary?

• She must change the frequency of her hand movements.
• She must pull the spring tighter.
• She must vary the harmonics or overtones.
• She must vary the amplitude of her hand movements.

A 12-g ball moving 4.0 m/s​ collides head on and inelastically with a second 12-g ball initially at rest. After colliding, the balls move together at the speed

• 2.0 m/s
• 3.0 m/s
• 4.0 m/s
• 6.0 m/s