J physics 19

The value of T in the figure above is

Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?

Radio waves belongs to the class of ware whose velocity is about

The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

When water is boiling, it

The following are parts of the eye

I. Retina

II. Pupil

III. Iris

The correct equivalent in the camera in the same order are

Neutrons were discovered by

Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

The resultant capacitance in the figure above is

- angle of dip is zero at the magnetic equator
- angle of variation is the same as angle of declination.

A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

Gases conduct electricity under

A rectangular solid black has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density 100kg/m³, calculate the pressure it exerts on the surface.

Which of the following is/are the limitations to the Rutherford's atomic models?

I. It is applicable when energy is radiated as electrons are revolving

II. It is applicable when energy is radiated in a continuous mode

III. It is applicable to an atom with only one electron in the other shell

Aluminium is sometimes used as the leaf of an electroscope because it

In the molecular explanation Free molecules conduction, heat is transferred by the

The lead-acid accumulator consists of

An object is acted upon by a system of parallel three causing the object to be in state equilibrium. Which of the following statement is not correct

A boy pushes a 500kg box along a floor with a force of 2000N. If the velocity of the box is uniform, the co-efficient of friction between the box and the floor is

According to kinetic molecular model, in gases

The equilibrium position of objects in any field corresponds to situation of

The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?

I. Lagging the Calorimeter

II. Ensuring that only S.I units are used

III. Weighing the calorimeter, the lid and the stirrer.

The conductivity of gases at low pressure can be termed as

I. hot cathode emission

II. thermo ionic emission

III. cold cathode emission

IV. Field emission

When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is

The mass of a nucleus is the

Which of the following statement about the electromagnet shown above is correct?

Which of the following characteristics of a wave is used in the measurement of the depth of the Sea?

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

"Sum of all forces acting on a body is zero." This condition represents equilibrium'

According to kinetic molecular model, in gases

The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

A man on a bench will exert the greatest pressure on the bench when he

The following are some units
I. Ns
II. Non
III. Nm^-2
IV. J°K^-1
V. JKg^-1

What are the units of latent heat?

When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl and her image reduces a speed of