UNN Physics 2010/2011 Past Questions

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

Which of the following statements is true of the period of a simple pendulum?

A.it depends on the mass of the bob and the acceleration due to gravity
B.it depends on the length of the string and acceleration due to gravity
C.it depends on the mass of the bob and the length of the string
D.it depends on the mass of the bob, the length of the string and acceleration due to gravity

A boat travels due east with a speed of 40m/s across a river flowing due south at 30m/s. Calculate the resultant speed of the boat.

A.1.3m/s
B.10.0m/s
C.50.0m/s
D.70.0m/s

Objective

Question 3

The atmospheric pressure due to water is 1.3 x 10⁶ Nm^-2. What is the total pressure at the bottom of the ocean 10m deep? (Density of water = 1000 kg/m and g = 10m/s).

A.1.3 x 10⁷ Nm^-2
B.1.4 x 10⁶ Nm^-2
C.1.4 x 10⁶ Nm^-2
D.1.0 x 10⁵ Nm^-2

Objective

Question 4

Which of the following conditions will make water boil at a temperature of 100°C and saturation vapour pressure of 750mmHg?

A.decrease the external pressure
B.heat more rapidly at the same pressure
C.increase the external pressure
D.reduce the quantity of water

Objective

Question 5

The density of a fixed mass of gas at constant pressure is

A.constant with temperature
B.directly proportional to the temperature
C.inversely proportional to the temperature
D.directly proportional to its volume

Objective

Question 6

Which of the following equations is incorrect about an ideal gas (all the symbols have their usual meanings)

A.PV = nRT
B.PV/T = constant
C.PV = 3/2nRT
D.TV/P = constant

Objective

Question 7

The equation of a wave travelling along positive x-direction is given by y = 0.20sin(500t - 20x). The amplitude, angular frequency and wavelength of the wave are respectively given by

A.0.2cm, 500rad/s, 20cm
B.0.2cm, 500rad/s, 0.1π cm
C.0.2cm, 2 x 10^-3 rad/s, 0.1πcm
D.5cm, 2 x 10^-3, 0.05cm

Objective

Question 8

When a plane mirror at which a ray of light is incident is rotated through an angle θ, the reflected ray will be rotated through

A.1/2θ
B.θ
C.2θ
D.3θ

Objective

Question 9

The quality of sound depends on its

A.frequency
B.wavelength
C.velocity
D.harmonics

Objective

Question 10

The resistance of a piece of wire of length 20m and cross sectional area 8 x 10^-6 m² has a resistance of 1 ohm. the resistivity of the wire is

A.3 x 10^-7 ohm/m
B.4 x 10^-7 ohm/m
C.1.6 x 10^-5 ohm/m
D.4 x 10^-5 ohm/m

Objective

Question 11

In an AC circuit that contains only a capacitor the voltage

A.leads the current by 90°
B.lags behind the current by 90°
C.leads the current by 180°
D.lags behind the current by 180°

Objective

Question 12

The angle between the direction of the earth's magnetic field and the horizontal is called

A.angle of deviation
B.magnetic declination
C.magnetic meridian
D.angle of dip

Objective

Question 13

Which of these statement is not correct concerning atomic structure?

A.negatively charged electrons orbit the positively charged nucleus
B.electromagnetic forces bind the electrons to the nucleus
C.protons and neutrons have approximately equal mass
D.the number of electrons orbiting the nucleus is equal to the number of nucleons

Objective

Question 14

The half-life of a radioactive element is 9 days. Calculate the fraction that remains after 36 days

A.1/32
B.1/16
C.1/4
D.15/32

Objective

Question 15

One of the features of the fission process is that

A.it leads to chain reaction
B.its products are not radioactive
C.neutrons are not released
D.mass and energy are conserved

Objective