Which of the following quantities is not an example of force?

The reason for laminating the soft iron core of a transformer is to

Formation of hydrogen bubbles at the copper plate of a primary cell is called

Which of the following factors does not affect the rate of evaporation of a liquid?

The opening in the eye through which light passes to the retina is called the

A heat sensitive resistor made of a semiconductor is called a

Electric motor primarily converts

Which of the following statements about the molecules of solids and liquids is correct? They both

The distance between a node and its adjacent antinode of a transverse wave is equal to

Which of the sketched graphs below illustrates the correct variation of the gravitational force, Fg, between two objects and the distance, d, between their centres?

Which of the following actions will increase the capacitance of a parallel plate capacitor? I. Decreasing the distance between the plate II. Increasing the distance between the plates III. Increasing the area of the plates overlap IV. Avoiding the use of dielectric between the plates

A metallic sphere is heated from 27°C to 200°C without change of state. Which of the following changes would have resulted from the heating?

The acceleration of a moving object can be determined from the

A student wishes to measure the potential difference across a resistor, R. She has a galvanometer, G and some connecting wires; what else does she need?

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000 N if the efficiency of the jack is 30%? [pi = 22/7]

The inductive reactance in a circuit of frequency 100 Hz is 1 Ohm. Calculate the inductance of the inductor. [pi = 3.14]

The diagram above illustrates the velocity-time graph of a body. Calculate the distance covered by the body during the motion.

An atom that emits an alpha-particle

Which of the following units is equivalent to the unit of electric current?

A ball is swung in a horizontal circle of centre O with a constant speed. What is the direction of its acceleration?

Which of the following statements is an effect of compressing gas molecules at constant temperature?

The diagram above is an illustration of an a.c. circuit. Calculate the reactance of the capacitor.

A current of 2 A passes through a wire of resistance 4 ohm for 3 minutes. Calculate the energy lost.

Which of the following statements about the universal gravitational constant, G, is true?

The sketched graph above represnts a progressive wave moving from the left to the right. The period of waves is 0.125s. Use the graph to answer questions 25 and 26 Determine the values of the amplitude and wavelength, respectively, of the wave:

The sketched graph above represnts a progressive wave moving from the left to the right. The period of waves is 0.125s. Use the graph to answer questions 25 and 26 . Determine the speed of the wave.

Which of the following curved surfaces will produce a real image? I. Concave mirror II. Convex mirror III. Diverging lens IV. Converging lens

The components of vectors Q and R are (-3.0, 5.5) and (9.2, 4.4), respectively. Determine the components of Q + R.

Which of the arrangements of radiations below shows decreasing order of wavelengths?

An electric pressing iron is connected to the mains using an insulated wire. After some minutes, the wire becomes very hot. The heat generated in the wire can be minimized by replacing the wire with one of

In the diagram above, a bulb is lit by drawing 2.0 A from 440 V a.c. source. Calculate the cost of keeping the bulb on for two days at 0.40 Kilowatt- hour

A wire of cross-sectional area 2π × 10⁻⁸ m and resistivity 1.1 × 10⁻⁸ m, has a resistance of 21 Ω. Calculate the length of the wire. π = 22/7.

Which of the following statements best describes the particles in a solid at room temperature?

A man weighing 200N runs up a staircase in 5s. If the height of the staircase is 9m, calculate the power of the man.

A rotating disc contains a set of holes in a circle. An air jet is directed onto the holes and a note of frequency 480Hz is produced. If the number of holes is 20, calculate the speed of rotation of the disc

A force of 10N, acting continuously, increases the kinetic energy of an object from 20J to 60J. Find the distance moved by the object.

An electric circuit consists of a resistor, a battery and a key. If the voltage of the battery is increased, there would be an increase in the

A radioactive material has a half-life of 1.0 hour. If 200.0g of it was present at 6 a.m. on a certain day, how many grams will have decayed by 9 a.m. on the same day?

The following statements about a loudspeaker are correct except

An ice cube has mass of 20 g at 5 °C. Calculate the energy required to raise its temperature to 0 °C. [Specific heat capacity of ice = 2.1 J g⁻¹ °C⁻¹]

A stone is thrown horizontally with initial velocity 15 m/s from a tower 20 m high. How long does it take to reach the ground? [g = 10 m/s²].

Which of the following statements is not a characteristic of a plane progressive wave?

The electrons in a cathode-ray tube are produced by

Which of the following statements about distance and displacement is not correct?

A note produced by an instrument is distinguished from a similar note produced by another instrument by the

According to Pascal's principle, the pressure in a fluid

Which of the following sets of quantities have members which are all vectors?

If the relative humidity of the atmosphere increases, the rate of evaporation of sweat from the human body

Which of the following factors does not determine the resistance of a wire? It’s

Which of the following scientists suggested that moving particles exhibit wave properties?