Jamb Physics 2019 Past Questions and Answers

Question 31:

• JAMB 2019

A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge

A. 8 x 10\(^{-4}\)C
B. 4 x 10\(^{-2}\)C
C. 8 x 10\(^{-3}\)C
D. 4 x 10\(^{-8}\)C

Question 32:

• JAMB 2019

A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

A. 5Hz
B. 6Hz
C. 5.2Hz
D. 25Hz

Question 33:

• JAMB 2019

A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

A. 100\(^o\)C
B. 248\(^o\)C
C. 250\(^o\)C
D. 350\(^o\)C

Question 34:

• JAMB 2019

An alternating current can induce voltage because it has

A. Ripple value
B. Varying magnetic field
C. Weaker magnetic field than direct current
D. High peak value

Question 35:

• JAMB 2019

The limiting frictional force between two surfaces depends on
I. the normal reaction between the surfaces
II. the area of surface in contact
III. the relative velocity between the surfaces
IV. the nature of the surfaces

A. I only
B. II only
C. III only
D. I & IV only