2019 - JAMB Physics Past Questions and Answers - page 9
The angular dispersion of a prism depends on
The index of refraction only
The angle of incidence as well as the index of refraction
The angle of incidence only
The thickness of the prism only
The angular dispersion of prism depends on the speed or the wave length of the particular colour. The colour having the highest speed ( red ) undergoes least deviation in its direction whereas the colour having the least speed ( violet ) undergoes most deviation in its direction.
Which of the following statements are correct of the production and propagation of waves?
I. vibration produces waves
II. waves transmit energy along the medium
III. the medium through which the wave travels does not travel with the wave
IV. waves do not require any medium for transmission
I & IV only
II & IV only
III & IV only
I, II and III only
Waves occur due to vibration. The resulting waves transmit energy along with the medium. Particles of the medium vibrate with the wave motion without the entire medium
A rectangular solid black has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density 100kg/m\(^3\), calculate the pressure it exerts on the surface.
| P | = | F
A |
= | mg
A |
= | (ρ × v) × g
A |
= | ρ × (A × h) × g
A |
P = 100 × 2 × 10\(^{-2}\) × 10 = 200 N/m\(^2\)
The diagram shows four positions of the bob of a simple pendulum. At which of these positions does the bob have maximum kinetic energy and minimum potential energy
1
2
3
4
the bob has maximum kinetic energy and minimum potential energy at the lowest point
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
the resultant of the parallel forces is zero
the algebraic sum of all the moments of the forces is zero
all the parallel forces must be equal in magnitude and direction
the sum of forces in one direction must be equal to the sum of forces in the opposite direction
The parallel forces must be equal in magnitude and direction
Which of the following statements is/are correct for a freely falling body?
I. the total is entirely kinetic
II. the ratio of potential energy to kinetic energy is constant
III. the sum of potential and kinetic energy is constant
I only
II only
III only
I & III only
Total energy at any point is a combination of the P.E and K.E
The sum of PE and KE at any point is always constant but the same cannot be said for the ratio of P.E to K.E
Efficiency of conduction in liquids and gases compared to solids is
less efficient than solid
more efficient than solids
equally efficient to solids
efficiently may vary
A well 1km deep is filled with a liquid of density 950kg/m\(^3\) and g = 10m/s\(^2\), the pressure at the bottom of the well is
9.6 × 10\(^6\)N/m\(^2\)
9.5 x 10\(^5\)N/m\(^2\)
9.4 x 10\(^6\)N/m\(^2\)
9.5 x 10\(^6\)N/m\(^2\)
P = Pa + ρgh
= (1.00 × 10\(^5\)) + (950 × 10 × 1000)
P = 10\(^5\) + (95 × 10\(^5\)) = 10\(^5\)(1 + 95) = 96 × 10\(^5\)
P = 9.6 × 10\(^6\) N/m\(^2\)
"Sum of all forces acting on a body is zero." This condition represents equilibrium's
First condition
Second condition
Third condition
Fourth condition
Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?
II only
III only
I & IV only
II & III only
I & II exhibit a neutral equilibrium.
III shows a body with a high centre of gravity position making it unstable
IV is a body with a low centre of gravity (stable)