BUK Physics 2014/2015 Past Questions

Practice each question, then open it to see the full details.

A rope is attached to a block that has weight of 120N. When the rope exerts an upwards force of 250N on the block

A. 130N up
B. 370N up
C. 130N down
D. 370N down

A satellite in a circular orbit around earth has a constant speed not a constant velocity. Which of the following statements best explains why the satellite's velocity is not constant?

A. The radius of the satellite's orbit is too large
B. The force on the satellite's mass is constantly decreasing
C. The magnitude of the satellite's momentum is too large
D. The direction of the satellite's motion is constantly changing

Which of the following statements describes an electric generator?

A. A magnet is rotated through a coil of wire to produce an electric current
B. Electric potential in a rotating coil of wire creates a permanent magnet
C. An electric current causes a coil of wire to rotate in a magnetic field
D. Forces from a permanent magnet allow coil of wire to rotate

A neutral balloon is rubbed with a piece of wool cloth. As a result, the balloon has a negative static charge. Which of the following statements best explains why the balloon has a negative charge?

A. The balloon is a conductor
B. The balloon is an insulator
C. The balloon transfers charges to the cloth
D. The balloon receives charges from the cloth

What is the magnitude of the momentum of a 0.50kg ball moving in a straight line at 5.0m/s?

A. 0.1 kgms^-1
B. 2.5 kgms^-1
C. 6.3 kgms^-1
D. 10 kgms^-1

The human ear is most sensitive to sound that has a frequency of about 4000Hz. Assuming that the speed of sound in air is 340m/s. What is the wavelength of a sound heard in the air with this frequency?

A. 0.043 m
B. 0.085 m
C. 12 m
D. 340 m

A light bulb with a potential difference of 120V across it, carries a current of 1.5A. Which of the following is the power consumption of the light bulb?

A. 0.013 W
B. 80 W
C. 120 W
D. 180 W

An electric fan has a power output of 60 W. How much work is done if the fan operates for 120s ?

A. 0.5 J
B. 50 J
C. 120 J
D. 7200 J

During a thunderstorm, which of the following travels at a speed closest to 3.00 × 108 m/s

A. Wind from the storm
B. Sound from the thunder
C. Light from the lightening
D. Rain from the storm clouds

An athlete is training for a race by performing timed trials of sprints up a staircase. Which set of variables most directly affects the athelete's power?

A. Body weight, height climbed, width of steps
B. Body weight, time spent climbing, width of steps
C. Height climbed, time spent climbing, body weight
D. Height climbed, time spent climbing, width of steps

An appliance draws 4Amps of current when connected to 120V. What is the resistance of the appliance

A. 0.03 Ω
B. 30 Ω
C. 124 Ω
D. 480 Ω

Which of the following statements best explains heat flows by conduction?

A.A large mass of air begins to move faster
B. Energy is transferred by electromagnetic waves
C. Energy is transferred from molecule to molecule
D. A large mass of warm air rises, replacing the cooler above

A person starts driving and travels 3km east to a store. The person then turns around and travels 1 km west to another store. Finally, the person travels 2 km East, back to the starting point. What distance has this person travelled?

A. 0km
B. 3km
C. 5km
D. 6km

A 2m long pendulum swings back and forth 6 times in 17 seconds. What is the period of the pendulum?

A. 0.4s
B. 2.8s
C. 12s
D. 34s

Which of the following always occurs when a light reflects off a mirror

A. The speed of the light ray increases
B. The direction of light ray stays the same
C. The frequency of the light ray decreases as it reflects and loses energy to the mirror
D. The angle at which the light ray strikes the mirror equals the angle at which it reflects

Two positively charged objects separated by a large distance. One of the positively charged objects is replaced by a negatively charged object, and the two objects are moved closer to each other. Which of the following occurs in this situation?

A. The attractive force becomes a repulsive force which increases as the object moves closer to each other
B. The repulsive force becomes an attractive force which increases as the objects move closer to each other
C. The attractive force becomes a repulsive force which decreases as the objects move closer to each other
D. The repulsive force becomes an attractive force which decreases an the objects move closer to each other

Which of the following has the greatest momentum

A. 0.2 kg ball moving at 40 m/s
B. 500 kg car travelling at 16 m/s
C. 2000 kg truck travelling at 9 m/s
D. 50 kg child skateboard at 4 m/s

What method of the heat transfer allows the sun's heat energy to reach Earth through the vacuum of space

A. Condensation
B. Conduction
C. Convection
D. Radiation

A current of 2A passes through an 8V load. What is the potential difference across the load

A. 0.25 V
B. 4.0 V
C. 10 V
D. 16 V

A man standing 300m away from a wall sounds a whistle. The echo from the wall reaches him 1.8s later. Calculate the velocity of sound in air

A. 540 m/s
B. 333.3 m/s
C. 270.0 m/s
D. 166 m/s

Which of the following radiations have the highest frequency

A. Radio waves
B. Light waves
C. X-Rays
D. Infra-red rays

Which of the following is used for controlling the amount of light entering the eye

A. Cornea
B. Pupil
C. Iris
D. Optic nerve

Which of the following statements is correct about cathode rays? They are fast moving

A. Atoms
B. Ions
C. Neutrons
D. Protons

An image which cannot be formed on a screen is said to be

A. Inverted
B. Real
C. Virtual
D. Erect

Which of the following is usually used to cause fission in an atomic reactor

A. Alpha particles
B. Beta particles
C. Electrons
D. Neutrons