The vacuum and silvered surfaces of a vacuum flask walls are to respectively

The magnitude of the acceleration of a moving object is equal to the

In which of the following states is maximum pressure exerted on a person?

What are cathode rays?

The capacitance of a parallel plate capacitor

The diagram above illustrates the motion of a cyclist from P to R. The distance travelled is determined by the

A ray of light travels from a less dense medium to a denser medium. How are the speed and frequency of the light affected? The speed

The function of a fuse in an electric circuit is to

A body moves with uniform velocity when the resultant force on it is

The law of conservation of momentum is stated for closed and isolated system. What are the two conditions for a system to be closed and isolate

A stone of mass 200 g attached to a string is made to revolve in a horizontal circle of radius 1.5 m at a steady speed of 5 ms^-1. Calculate the tension in the string at the bottom of the circle. [g= 10ms^-2]

To convert a milli-ammeter to an ammeter, it is necessary to connect a resistor of

An object is placed 1.5 m from a plane mirror. How far is the image from the object?

Chromatic aberration in lenses can be corrected by using a combination of

A cube of wood of side 10.0 cm floats vertically in water with 4.5 cm of its length submerged. Calculate the density of the wood. [Density of water = 1  gcm^-3

A temperature of 60 degree celcious  is equivalent to

All of the following uses are practical applications of x-ray except

Two isolated charged spheres each of magnitude +1.0×10⁻⁶ C are separated by a distance of 2.0×10⁻¹ m. Calculate the magnitude of the electrostatic force between them. [ K = 1/(4πε₀) = 9 × 10⁹ N m² C⁻² ]

In the circuit diagram above, which lamp causes the other to go off?

A particle of mass 3.6 × 10⁻⁶ kg revolving around the earth has a radial acceleration of 4.3 × 10⁷ m/s². Calculate the centripetal force of the particle.

For a convex lens to form a real image, the distance between the object and the screen will be

A constant voltage source supplies a sinusoidal alternating e.m.f , the voltage marked against the components are the peak values.

Determine the peak value of the applied e.m.f. [based on circuit diagram showing 6V, 3V, 2V components]

A 2 µF capacitor is connected directly across a 150 V, 60 Hz A.C. source. Calculate the rms value of the current.

A body of mass, m is projected vertically upward with a velocity, v. At what position will the potential energy be maximum?

Light of energy 1.12 × 10⁻¹⁸ J is incident on a metal of ejected electrons with maximum energy of 8.0 × 10⁻¹⁹ J. Calculate the threshold frequency of the metal. [h = 6.626 × 10⁻³⁴ Js]

An object 2.0 cm high is placed at the radius of curvature of a concave mirror such that it is perpendicular to the principal axis of the mirror. Determine the height of the image.

The diagram above illustrates two boxes P and Q of masses 27.3 kg and 6.2 kg respectively on a smooth horizontal

surface. If a force of F of 150 N is applied to the combined forces, calculate the acceleration.

A boy of mass 40 kg jumps off a stationary skateboard and moves horizontally with a speed of 1.5 m/s while the skateboard moves in the opposite direction with a speed of 20 m/s. Calculate the mass of the skateboard.

The depolarizing agent in a Leclanché cell is

Which of the following terms has different dimension from the other?

A capacitor described as a mica capacitor has

In which of the following devices is the thermal expansion considered a disadvantage?

The inside portion of a hollow metal sphere of diameter 20 cm is polished. The portion will therefore form a

Which of the following statements about a projectile is not correct?

Atmospheric pressure decreases with an increase in altitude because

The main difference between x-rays and gamma rays is in their

The phenomenon used for explaining the formation of a rainbow in the sky is

Which of the following modes is the most economical method of transmitting electrical power over a long distance?

The correct sequence of ionization power of alpha particle, gamma ray and beta particle respectively is

Four pieces of constantan wire, marked E, F, G and H, each of length 1.0 m, are at the same temperature. Their respective diameters are 1 mm, 2 mm, 6 mm and 10 mm. Which wire has the highest resistance?

The maximum displacement of particles from equilibrium position in a wave motion is known as

A non-conducting vessel contains a liquid of mass 70.0 g at 25 °C. Another 70.0 g of the same liquid at 35 °C is quickly poured into the vessel. Determine the final temperature of the mixture.

A galvanometer of full-scale deflection 10 mA has a resistance of 5 ohm. Calculate the shunt needed to convert it to measure a current of 2.4

In storing magnets, the keepers are used to

Which of the following factors does not affect the speed of sound?

A convex mirror is used as a driving mirror; however, a disadvantage in this regard is that the image it produces is

The amount of heat energy that will be extracted when 0.02 kg of water vapor condenses to water at 97 °C is [Specific latent heat of vaporization of water = 2.26 × 10⁶ Jkg⁻¹, Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹].

Water is readily available, but it is not a thermometric liquid mainly because

The constant temperature at which a liquid change into gaseous state is known

The diagram above illustrates the graph for A. the variation of the volume of a gas with increasing temperature.