Ampere-hour is the unit of which among the following?

A stroboscope works by making moving or rotating objects appear

In order to remove the error of parallax  when taking measurements with a meter rule, the eye should be focused

Calculate the gravitation force of attraction between two planets of 10^24 kg and 10^27 kg separated by a distance of 10^20 m.

If the volume of a gas is recorded as 76 cm³ at a temperature of 27°C with a pressure of 800 mmHg. What will be the volume of the gas at S.T.P.?

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100m/s. The recoil speed of the machine gun is

A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point Q. What is the total displacement?

Radio waves belong to the class of waves whose velocity is about

Which metal is commonly used for making an electromagnet?

Who discovered X-Rays?

The general gas law can be written as

Which of the following readings cannot be determined with a meter rule?

Which is the least possible error in using a rule graduated in cm?

Primary colors of light are

The heating element of an electric heater is made of ____

Two points on a velocity time graph have co-ordinates (5s, 10m/s) and (20s, 20m/s). Calculate the mean acceleration between the two points.

Which of the following statements are true about the spring balance and the chemical balance?

I. a change in gravity changes the reading of a spring balance but not that of a chemical balance.
II. both are used to measure the mass of an object.
III. either of them may be used to measure the weight of an object.
IV. the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments.

Which of the following sets consist entirely of scalar quantities?

Fire in the diesel engine is produced by which of the following?

Which of the following physical quantities is NOT a vector?

The dimensions of surface tension are

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at an angle of 60° to the floor. The work done after a distance of 3m is

A man walks 8km north and then 5km in a direction 60° east of north. Find the distance from his starting point.

The resultant of two forces acting on an object is maximum when the angle between them is

A platinum resistance thermometer has resistances of 5.25Ω and 9.75Ω at 0°C and 100°C respectively. When the resistance is 8.25Ω, the temperature is

The external parts of an object can be measured accurately through the use of which scientific instrument?

A machine has a V.R of 4. If it requires 800N to overcome a load of 1600N, what is the efficiency of the machine?

The ozone layer protects us from

Light from the laser is ________.

Boyle's law may be written as

Which of the following pairs of physical quantities comprises vectors?

If the tape of a ticker-timer shows dots equally spaced at 1cm apart and the vibrator makes 50 dots per second, what is the speed of the tape in m/s?

Two cars moving in the same direction have speeds of 100km/h and 130km/h. What is the velocity of the faster car as measured by an observer in a slower car?

Which of the following is not a luminous object?

With an increase in pressure the melting point of water will

An Eagle flying due north with a velocity of 15m/s sheds a feather in an air current blowing at 20m/s due east. The feather will move with a velocity of

The distance X, metres travelled by a particle in time, t seconds is described by the equation X = 10 + 12t².
Find the average speed of the particle between the time interval, t = 2s and t = 5s.

Which among the following is the best conductor of electricity?

Which of the following is a fundamental unit?

Which of the following quantities are scalar? 

I. electric potential
II. momentum
III. kinetic energy
IV. torque

In an elastic collision:

I. Energy is conserved.   
II. Energy is decreased   
III. Energy is increased   
IV. Linear momentum is conserved

One of the following readings represents the measurement of the length of a metal rod using vernier callipers.

A tugboat is travelling from Lagos to Morocco across the river Nile with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is

At what temperature are the temperatures on the Celsius and Fahrenheit scales equal? 

The resultant force of a couple is

The power source of a ticker-timer vibrates 40 times in one second. If the ticker-timer made 200 dots during an experiment, determine how long the experiment lasted

A body accelerates uniformly from rest at 6m/s² for 8 seconds and then decelerates uniformly to rest in the next 5 seconds. The magnitude of the deceleration is

Radio waves belong to the class of waves whose velocity is about

The ice point and steam points on a thermometer corresponds to X and 80mm respectively. A temperature of 60°C corresponds to 52mm on the thermometer. The value of X is

At what temperature will the density of water be maximum?

The international agreed system of units (S.I) for physical measurements  are?

Which among the following are primary colors?

Which of the following is a set of vectors?

Find the acceleration of a body of mass 20kg under forces of 3N and 10N acting horizontally in opposite directions

A vernier scale was formed by dividing a length of 19mm into 20 equal parts. If this vernier is used with a main scale marked in mm, what is the smallest distance that can be measured?

Electrons were discovered by

A particle of  weight 120N is placed on a plane inclined at an angle 30° to the horizontal. If the plane has an efficiency of 60%, what is the force required to push the weight uniformly up the plane?

What is the relationship between mechanical advantage (MA), velocity ratio (VR) and efficiency in percentage?

In order to remove the error of parallax when taking measurements with a meter rule, the eye should be focused

Persistence of vision is the principle behind?