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2x109Hz? Answer 0.30 m 0.15...

What is the wavelength of the microwaves of frequency 2x109Hz? Answer 0.30 m 0.15 m 0.50 m 0.60 m Question 2 Which of the following is correct for the reflected ray if a light ray strikes a plane mirror at an angle of 50° from the normal? Answer 40° from

the surface of the mirror 40° from the normal 50° from the surface of the mirror 90° from the normal Question 3 A load of 15 N attached to a spring that is hanging vertically stretches the spring 35 cm. What is the spring constant of the spring? Answer 43

N/m 525 N/m 23 N/m 233 N/m Question 4 What is the frequency of a pendulum that completes 40 cycles in 8 minutes? Answer 5.00 Hz 2.00 Hz 0.08 Hz 0.02 Hz Question 5 If sound is increased in intensity by a factor of 1000, what is the change in decibels? Answer

3 30 100 300 Question 6 The second harmonic of a guitar string has a frequency of 120 Hz. What is the length of the guitar string if the speed of the waves on the string is 110 m/s? Answer 0.7 m 0.9 m 1.6 m 1.4 m Question 7 When a torch is brought 2 times

closer, how many times brighter will it appear? Answer 2 4 9 16 Question 8 A concave mirror with a focal length of 10.0 cm creates a real image that is 30.0 cm away from its principal axis. How far is the corresponding object from the mirror? Answer -10 cm

15 cm 10 cm -15 cm A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double convex lens having a focal length of 15.0 cm. How tall is the image? Answer 1.50 cm 3.00 cm 6.00 cm 9.00 cm Question 10 A diffraction grating that contains 650472 lines/m

is illuminated by monochromatic light (λ=632.8 nm) from a helium-neon laser directed perpendicular to the surface of the grating. What is the angle for the second order maxima to occur? Answer 55° 24° 45° 48° Question 11 What happens to the force between the

charges if the distance between the charges is increased to two times its original value? Answer Value of the force is increased by two. Value of the force is decreased by two. Value of the force is decreased by four. Value of the force is increased by four.

Question 12 A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere? Answer 4x10^-13 10x10^13 4x10^13 10x10^-13 A capacitor has a charge of 5 µC when charged by a potential difference of 1.5 V. What is the capacitance of the

capacitor? Answer 3.3x10^-6F 3.3x10^6F 7.5x10^-6F 0.3x10^6F Question 16 Two positive charges of 6 µC are separated by a distance of 50 cm in air. What is the electric field strength at the midpoint of the line joining the charges? Answer 72.0 V/m 64.8 V/m

6.0 V/m zero V/m Question 17 When an electron moves 2.5 m in the direction of an electric field, the change in electrical potential energy of the electron is 8x10-17J. What is the strength of the electric field that causes the change in potential energy? Answer

320 N/C 200 N/C 20 N/C 3.2 N/C Question 18 Two resistors 10 Ω and 5 Ω are connected in parallel across a 15 V battery. What is the potential difference across the 10 Ω resistor? Answer 5 V 10 V 15 V 20 V Question 19 If a bulb of 5 Ω is connected across a 12

V battery, what is the current flow through the bulb? Answer 0.4 A 2.4 A 4.0 A 7.0 A Question 20 An electric kettle operates at 110V. What is the resistance of the kettle if the power is 1.5kW? Answer 8.1 Ω 1.4 Ω 81 Ω 14 Ω Question 21 Three resistors having

the same resistance value are wired in parallel. How does the equivalent resistance compare to the resistance value of a single resistor? Answer The equivalent resistance is thrice the value of a single resistor. The equivalent resistance is the same as the

value of a single resistor. The equivalent resistance is one third the value of a single resistor. The equivalent resistance is greater than the value of a single resistor. Question 22 Two resistors 3 Ω and 6 Ω are connected in parallel across a 6 V battery.

What is the current flow through the 3 Ω resistor? Answer 6 A 3 A 4 A 2 A Question 23 A 1500 W room heater is used daily for 4 hours during winter. If the cost per kWh is $0.5, what is the monthly (30 days) expense in using the room heater? Answer $ 9.0 $

23 $ 90 $ 180 A current of 60 mA passes through a loudspeaker of resistance 6 Ω. What is the potential difference across the resistance of the loudspeaker? Answer 36.0 V 10.0 V 0.36 V 0.10 V Question 25 Current flow through a lamp is 1.3 A. How many Coulombs

of charge are passed through the lamp in 2 minutes? Answer 2.6 Coulombs 39 Coulombs 78 Coulombs 156 Coulombs If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length?

Answer The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase.

the surface of the mirror 40° from the normal 50° from the surface of the mirror 90° from the normal Question 3 A load of 15 N attached to a spring that is hanging vertically stretches the spring 35 cm. What is the spring constant of the spring? Answer 43

N/m 525 N/m 23 N/m 233 N/m Question 4 What is the frequency of a pendulum that completes 40 cycles in 8 minutes? Answer 5.00 Hz 2.00 Hz 0.08 Hz 0.02 Hz Question 5 If sound is increased in intensity by a factor of 1000, what is the change in decibels? Answer

3 30 100 300 Question 6 The second harmonic of a guitar string has a frequency of 120 Hz. What is the length of the guitar string if the speed of the waves on the string is 110 m/s? Answer 0.7 m 0.9 m 1.6 m 1.4 m Question 7 When a torch is brought 2 times

closer, how many times brighter will it appear? Answer 2 4 9 16 Question 8 A concave mirror with a focal length of 10.0 cm creates a real image that is 30.0 cm away from its principal axis. How far is the corresponding object from the mirror? Answer -10 cm

15 cm 10 cm -15 cm A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double convex lens having a focal length of 15.0 cm. How tall is the image? Answer 1.50 cm 3.00 cm 6.00 cm 9.00 cm Question 10 A diffraction grating that contains 650472 lines/m

is illuminated by monochromatic light (λ=632.8 nm) from a helium-neon laser directed perpendicular to the surface of the grating. What is the angle for the second order maxima to occur? Answer 55° 24° 45° 48° Question 11 What happens to the force between the

charges if the distance between the charges is increased to two times its original value? Answer Value of the force is increased by two. Value of the force is decreased by two. Value of the force is decreased by four. Value of the force is increased by four.

Question 12 A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere? Answer 4x10^-13 10x10^13 4x10^13 10x10^-13 A capacitor has a charge of 5 µC when charged by a potential difference of 1.5 V. What is the capacitance of the

capacitor? Answer 3.3x10^-6F 3.3x10^6F 7.5x10^-6F 0.3x10^6F Question 16 Two positive charges of 6 µC are separated by a distance of 50 cm in air. What is the electric field strength at the midpoint of the line joining the charges? Answer 72.0 V/m 64.8 V/m

6.0 V/m zero V/m Question 17 When an electron moves 2.5 m in the direction of an electric field, the change in electrical potential energy of the electron is 8x10-17J. What is the strength of the electric field that causes the change in potential energy? Answer

320 N/C 200 N/C 20 N/C 3.2 N/C Question 18 Two resistors 10 Ω and 5 Ω are connected in parallel across a 15 V battery. What is the potential difference across the 10 Ω resistor? Answer 5 V 10 V 15 V 20 V Question 19 If a bulb of 5 Ω is connected across a 12

V battery, what is the current flow through the bulb? Answer 0.4 A 2.4 A 4.0 A 7.0 A Question 20 An electric kettle operates at 110V. What is the resistance of the kettle if the power is 1.5kW? Answer 8.1 Ω 1.4 Ω 81 Ω 14 Ω Question 21 Three resistors having

the same resistance value are wired in parallel. How does the equivalent resistance compare to the resistance value of a single resistor? Answer The equivalent resistance is thrice the value of a single resistor. The equivalent resistance is the same as the

value of a single resistor. The equivalent resistance is one third the value of a single resistor. The equivalent resistance is greater than the value of a single resistor. Question 22 Two resistors 3 Ω and 6 Ω are connected in parallel across a 6 V battery.

What is the current flow through the 3 Ω resistor? Answer 6 A 3 A 4 A 2 A Question 23 A 1500 W room heater is used daily for 4 hours during winter. If the cost per kWh is $0.5, what is the monthly (30 days) expense in using the room heater? Answer $ 9.0 $

23 $ 90 $ 180 A current of 60 mA passes through a loudspeaker of resistance 6 Ω. What is the potential difference across the resistance of the loudspeaker? Answer 36.0 V 10.0 V 0.36 V 0.10 V Question 25 Current flow through a lamp is 1.3 A. How many Coulombs

of charge are passed through the lamp in 2 minutes? Answer 2.6 Coulombs 39 Coulombs 78 Coulombs 156 Coulombs If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length?

Answer The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase.

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