## BREAK NEWS

• A-level physics

### Moment of a force

• A-level physics

### State Archimedes’ principle.

• A-level physics

### Explain why velocity of a liquid at a wide part of a tube is less than that at a narrow part.

• A-level physics

• General

# Category: Physics questions and answers

### Explain why bicycle frame are hollow.

Bicycle frame is hollow to reduce weight while maintain strength. A tube is significantly tougher to bend than a rod. Also to reduce the ... Read More

### Explain the origin of lift force on the wings of a plane.

Air flows above the wing of a plane at high velocity hence low pressure. Below the wings, air flows at low velocity and hence high ... Read More

### Write Bernoulli’s equation and define each term in the equation.

Bernoulli’s equation   Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank you so much Read More

### Describe an experiment to verify the law the law of floatation.

Overflow can is filled with water up to spout level An object is lowered in the can until it floats. The displaced water is collected ... Read More

### State the law of flotation

A law of floatation states that a floating body displaces its own weight of fluid in which it floats.   Please Subscribe to promote ... Read More

### State and illustrate Archimedes’ principle.

Archimedes’ Principle: when a body is wholly or partially immersed in a fluid, it experiences an up thrust force equal to the weight of the ... Read More

### Define simple harmonic motion.

Simple harmonic motion is the motion of a body whose acceleration is directed towards a fixed point and is directly proportional to the displacement of ... Read More

### Explain why a cyclist bends inward while going round a curved path.

A cyclist bends inwards while going round a curved path to counter balance  centripetal force  provided by friction between the tyres and the road such ... Read More

### What is centripetal acceleration as applied to circular motion?

Centripetal acceleration is the rate of change of velocity of a body moving in a circular path.   Please Subscribe to promote this website. Subscription ... Read More

### State the laws of friction and explain each of them

State the laws of friction and explain each of them Friction force oppose relative motion between surfaces in contact. Explanation; surfaces have projections with small ... Read More

### State the conditions necessary for equilibrium of a rigid body under action of a system of forces.

State the conditions necessary for equilibrium of a rigid body under action of a system of forces. The sum of clock wise moments about a ... Read More

### Explain briefly how to locate the centre of gravity of an irregular sheet of cardboard.

Explain briefly how to locate the centre of gravity of an irregular sheet of cardboard. three holes are drilled around the edge of the cardboard. ... Read More

### Define moment of force and give its SI unit

Define moment of force and give its SI unit. Moment of force is the product of force and perpendicular distance from the line of action ... Read More

### State Newton’s law of motion and use them to derive the law of conservation of momentum.

Newton's laws of motion A body continues in its state of rest or uniform motion in a straight line unless acted upon by an external ... Read More

### Modern physic (A-level paper 1 section C) Revision questions and answers

(a) (i) What are cathode rays? (01marks) Cathode rays are streams of fast moving electrons (ii) State two properties of cathode rays (01mark) They are ... Read More

### Current electricity, Electrostatics and capacitor revision questions and answers ( A-level physics paper 2 section C)

1. (a) State Coulomb’s law of electrostatics (01marks) Coulomb’s law states that the force between two point charges is directly proportional to the product of ... Read More

### Geometrical optic (light) revision questions and answers

Geometrical optic revision questions and answers 1. (a) (i) derive the relationship, for convex lens, where u is the object distance, v is the image ... Read More

### Waves A-level revision questions with answers

(a) What is meant by interference pattern as applied to waves. (03marks) When two sound waves meet they superpose. The interference pattern produced depends on ... Read More

### Magnetism (A-level revision questions with answers)

1. (a)(i) Write down an expression for the force on a charge, q coulombs moving with velocity, u, at an angle, α, to a uniform ... Read More

### Explain why a current carrying conductor placed in a magnetic field experiences a force

Explain why a current carrying conductor placed in a magnetic field experiences a force The current sets up magnetic field around the wire. When the ... Read More

### A rectangular coil of N turns each of length, L, and breadth, b, is inclined at an angle θ to a uniform magnetic field of flux density B. Derive an expression for torque of the coil when a current I is passed through it.

A rectangular coil of N turns each of length, L, and  breadth, b, is inclined at an angle θ to a uniform magnetic field of ... Read More

### How can a d.c. generator be converted into an a.c. generator.

How can a d.c. generator be converted into an a.c. generator. To convert a d.c. generator to an a.c. generator, the ends of the rectangular ... Read More

### Explain the variation of successive ionization energy of an atom

The variation of successive ionization energy of an atom Successive ionization energy increases due to increase increases in effective nuclear charge on the remaining electrons ... Read More

### With the aid of a diagram describe the structure and action of reflecting telescope

With the aid of a diagram describe the structure and action of reflecting telescope. Please subscribe to promote our website. Subscription is free. Thank you ... Read More

### Explain why chromatic aberration is not observed in simple microscope.

Explain why chromatic aberration is not observed in simple microscope. Please subscribe to promote our website. Subscription is free. Thank you so much Read More

### Draw the action of astronomical telescope in normal adjustment and derive an expression for magnification.

Draw the action of astronomical telescope in normal adjustment and derive an expression for magnification. Note, when an astronomical telescope is in normal adjustment, the ... Read More

What are the advantages of Galilean telescope? Advantages Forms an erect image with only two lenses. It short and potable because the distance between the ... Read More

### Draw a ray diagram to show the formation of a final image in Galilean telescope in normal adjustment.

Draw a ray diagram to show the formation of a final image in Galilean telescope in normal adjustment. Please subscribe to promote our website. Subscription ... Read More

### Describe with aid of a labelled diagram the structure and operation of a projection lantern.

Describe with aid of a labelled diagram the structure and operation of a projection lantern. Please subscribe to promote our website . Subscription is free. ... Read More

### State advantages of reflecting telescope over refracting telescope.

State advantages of reflecting telescope over refracting telescope. There is no chromatic aberration There is no spherical aberration High resolution The image is brighter It ... Read More

### What is the significance of the eye-ring of an astronomical telescope?

What is the significance of the eye-ring of an astronomical telescope? It is the best position for placing the eye, to view the image through ... Read More

### Define the Eye-ring as applied to a telescope?

Define the Eye-ring as applied to a telescope. This is the image of objective formed by the eyepiece and is the best position to place ... Read More

### Describe with aid of a diagram, a compound microscope forms image at near point

Describe with aid of a diagram, a compound microscope forms image at near point. Please subscribe to promote our website. Subscription is free. Thank you ... Read More

### State differences between a compound microscope and an astronomic telescope.

State differences between a compound microscope and an astronomic telescope. Compound microscope Astronomical telescope -          View near objects -          Objective lens has smaller      ... Read More

### Why should the objective and eye piece for compound microscope have short focal length?

Why should the objective and eye piece for compound microscope have short focal length? Please subscribe to promote our website. Subscription is free. Thank you ... Read More

### Draw a diagram to show the formation of an image by a compound microscope in in normal adjustment and use it to derive an expression for magnifying power

Draw a diagram to show the formation of  an image by a compound microscope in in normal adjustment and use it to derive an expression ... Read More

### Derive an expression for magnifying power of magnifying glass when the final image is formed at near point.

Derive an expression for magnifying power of magnifying glass when the final image is formed at near point. Please subscribe to promote our website. Subscription ... Read More

### State disadvantages of terrestrial telescope.

State disadvantages of terrestrial telescope. It long and bulky due extra image inverting lens Extra diffraction occurs in erecting lens reducing the clarity of the ... Read More

### What is angular magnification (magnifying power, M)?

What is angular magnification (magnifying power, M)? This is the ratio of the angle subtended at the eye by the image when using an instrument ... Read More

### What is a visual angle (α)?

What is a visual angle (α)? This is the angle subtended by the object at the unaided eye.   Please subscribe to promote our website. ... Read More

### What is accommodation?

What is accommodation? This is the ability of the eye to clearly see near and far object.   Please subscribe to promote our website. Subscription ... Read More

### What is a far point as applied to optical instrument?

What is a far point as applied to optical instrument? This is the furthest point which can be seen distinctly by the unaided eye. For ... Read More

### What is a near point?

What is a near point? This is the nearest position that can be focused distinctly by the unaided eye. The distance from the eye to ... Read More

### Define limiting angle of a prism.

Define limiting angle of a prism. This is the maximum angle of the prism for which light incident on the prism at 900 emerges from ... Read More

### A ray of monochromatic light is incident at a small angle of incidence on a small angle prism in air. Obtain the expression d= A(n-1), for deviation, d, of light by the prism where A is the refracting angle of the prism and n is the refractive index.

A ray of monochromatic light is incident at a small angle of incidence on a small angle prism in air. Obtain the expression d= A(n-1), ... Read More

### Describe how the refractive index of a prism can be determined using optical pins

Describe how the refractive index of a prism can be determined using optical pins Please subscribe to promote our website. Subscription is free. Thank you ... Read More

### Find an angle of incidence i, on equilateral prism of refractive index 1.5 placed in air, when light passes through which symmetrically

Find an angle of incidence i, on equilateral prism of refractive index 1.5 placed in air, when light passes through which symmetrically. Please subscribe to ... Read More

### When does light pass through the prism symmetrically?

When does light pass through the prism symmetrically? Light passes through the prism when the angle of incidence is equal to the angle of emergence. ... Read More

### Derive an expression for refractive index of a prism in terms of the refractive angle, A and the minimum deviation, D.

Derive an expression for refractive index of a prism in terms of the refractive angle, A and the minimum deviation, D. Please subscribe to promote ... Read More

### Show that m + 1 = u/f for a convex lens where symbols carry their usual meaning

Please subscribe to promote our website. Subscription is free. Thank you so much Read More

### Describe, giving the relevant equations, how the refractive index of a liquid can be determined using a convex lens of known radius of curvature

Describe, giving the relevant equations, how the refractive index of a liquid can be determined using a convex lens of known radius of curvature.   ... Read More

### Describe an experiment to determine the focal length of concave lens using a convex mirror of known focal length.

Describe an experiment to determine the focal length of concave lens using a convex mirror of known focal length. Please Subscribe to promote our website. ... Read More

### Describe how the focal length of a diverging lens may be determined.

Describe how the focal length of a diverging lens may be determined. Please subscribe to promote our website. Subscription is free Thank you so much Read More

### (d) Explain why lenses of narrow apertures are preferred to lenses of wide apertures in optical instrument.

Explain why lenses of narrow apertures are preferred to lenses of wide apertures in optical instrument. Lenses of narrow apertures show low spherical aberration. ... Read More

### Derive the relation between the focal length, f, object distance, u, and image distance, v, for a thin lens.

Derive the relation between the focal length, f, object distance, u, and image distance, v, for a thin lens. Please subscribe to promote our website. ... Read More

### With the aid of a diagram, explain why the image seen in a magnifying glass is almost free from chromatic aberration when the eye is close to the lens.

With the aid of a diagram, explain why the image seen in a magnifying glass is almost free from chromatic aberration when the eye is ... Read More

### How the aberrations in  minimized in a reflecting telescope?

How the aberrations in  minimized in a reflecting telescope? By grinding a lens so that it protrudes more near the center and making some adjustments ... Read More

### Explain how chromatic and spherical aberration are minimized in a photographic camera

Explain how chromatic and spherical aberration are minimized in a photographic camera By grinding a lens so that it protrudes more near the center and ... Read More

### With the aid of a labelled diagram, describe the essential parts of photographic camera.

Please subscribe to promote our website. Subscription is free Thank you so much Read More

### An object is placed a distance f + x from a converging lens of focal length, f. the lens produces an image at a distance f+ y from the lens. Show that f2 = xy

Please subscribe to promote our website. Subscription is free. Thank you so much. Read More