Cmoon is not completely hidden in the earth's shadow
Dmoon's umbra falls on some part of the earth
View Explanation & Discuss
Question 13
jamb2011
A certain far - sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm
A0.06 D
B0.02 D
C0.03 D
D0.04 D
Eno option is correct
View Explanation & Discuss
Question 14
jamb2011
The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?
A0.3
B6.0
C3.0
D2.0
View Explanation & Discuss
Question 15
jamb2011
When a red rose flower is observed in blue light, what colour does the observer see?
ARed
BBlue
CMagenta
Dyellow
ENo correct option
View Explanation & Discuss
Question 16
jamb2011
When the human eye loses its power of accomodation, the defect is known as
Ashort sightedness
Bpresbyopia
Castigmatism
Dlong sightedness
View Explanation & Discuss
Question 17
jamb2011
Three similar cells each of e.m.f 2 v and internal resistance 2Ω are connected in parallel, the total e.m.f and total internal resistance are respectively
A6 v, 6.0Ω
B2 v, 0.7Ω
C2 v, 6.0Ω
D6 v, 0.7Ω
View Explanation & Discuss
Question 18
jamb2011
I. change of state
II. Diffusion
III. Radiation
IV. Osmosis
which of the processes above can be explained using the kinetic theory?
AI, II,III and IV
BI, II and III
CI, III and IV
DI, II and IV
View Explanation & Discuss
Question 19
jamb2011
Steam burn is more severe than that of boiling water because
Asteam burn is independent of relative humidity
Bsteam possesses greater heat energy per unit mass
Cwater boils at a higher temperature
Dsteam burn is dependent on relative humidity
View Explanation & Discuss
Question 20
jamb2011
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
A900 JK-1
B90 JK-1
C100 JK-1
D200 JK-1
View Explanation & Discuss
Question 21
jamb2011
The phenomenon that shows that increase in pressure lowers the melting point can be observed in
Asublimation
Bcondensation
Ccoagulation
Dregelation
View Explanation & Discuss
Question 22
jamb2011
A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
A30 s
B10 s
C10 s
D15 s
View Explanation & Discuss
Question 23
jamb2011
The ground is always cold at night because the
Aatmosphere absorbs the sun's energy at night
Bearth radiates heat to the atmosphere at night
Csun no longer shine at night
Datmosphere reflects the sun's energy at night
View Explanation & Discuss
Question 24
jamb2011
A perfect emitter or absorber of radiant energy is a
Aconductor
Bblack body
Cwhite body
Dred body
View Explanation & Discuss
Question 25
jamb2011
Which of the following electromagnetic waves has the highest frequency?
Autra - violet rays
Bradio waves
Cx - rays
Dinfrared - rays
View Explanation & Discuss
Question 26
jamb2011
Which of the following types of waves needs a medium for propagation?
Asound waves
Blight waves
Cradio waves
Dx - rays
View Explanation & Discuss
Question 27
jamb2011
Which of the following could be effectively used to reduce friction?
Akerosene
Bgrease
Cwater
Dpetrol
View Explanation & Discuss
Question 28
jamb2011
I. Density of the liquid.
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?
AI and II only.
BII and III only.
CI, II and III only.
DI and III only.
View Explanation & Discuss
Question 29
jamb2011
A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?
A80 J
B500 J
C300 J
D120 J
View Explanation & Discuss
Question 30
jamb2011
I. High thermal capacity.
II. High sensitivity.
III.Easy readability.
IV. Accuracy over a wide range of temperature
From the statement above, the qualities of a good thermometer are
