A body of mass 7.5 kg is to be pulled up along a plane which is inclined at 30o to the horizontal. If the efficiency of the plane is 75%, what is the minimum force required to pull the body up the plane? (g = 10ms^-1)

• A. 5.0 N
• B. 20.0 N
• C. 50.0 N
• D. 75.0 N

A fixed mass of gas occupies a volume of 20\(cm^3\) at a fixed pressure of 700mmHg. Assuming that the temperature remains constant, what will be the volume of the gas at 750mmHg?

• A. 2.5\(cm^3\)
• B. 15.5\(cm^3\)
• C. 18.7\(cm^3\)
• D. 21.4\(cm^3\)

Water is unsuitable for use as a thermometric liquid because it

• A. expands unevenly between 0°C and 40°C
• B. has narrow temperature range
• C. has a concave meniscus
• D. msintsins fixed density

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms^-2)

• A. 25N
• B. 90N
• C. 96N
• D. 250N

A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction

• A. perpendicular to the circular path
• B. parallel to the circular path
• C. tangential to the circular path
• D. towards the center of the circle

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

• A. metre rule
• B. A pair of callipers
• C. A micrometer screw gauge
• D. A tape rule

(a) What is doping in a semi conductor?

(b) Draw the symbol for OR gate.

A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will

• A. Be a straight line
• B. Curve inwards
• C. Be a parabola
• D. Curve outwards

An object A is held in equilibrium as illustrated in the diagram below. Using the data on the diagram determine the magnitude, W of the weight of

• A. 23N
• B. 17N
• C. 7N
• D. 5N

A stone thrown horizontally from the top of a vertical ice is completely melted. Determine the total mass of wall with a velocity of 15ms\(^{-1}\), hits the horizontal ground water in the container at a point 45m from the base of the wall. Calculate the specific latent heat of steam = 2.3 x 10\(^3\) Jg\(^{-1}\) height of the wall. [g = 10ms\(^{-2}\)]

A stone thrown horizontally from the top of a vertical ice is completely melted. Determine the total mass of wall with a velocity of 15ms\(^{-1}\), hits the horizontal ground water in the container at a point 45m from the base of the wall. Calculate the specific latent heat of steam = 2.3 x 10\(^3\) Jg\(^{-1}\) height of the wall. [g = 10ms\(^{-2}\)]