A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at?
A0o
B45o
C90o
D180o
View Explanation & Discuss
Question 422
jamb2013
A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?
A0.05m
B0.15m
C0.30m
D1.00m
View Explanation & Discuss
Question 423
jamb2013
If a sonometer has a fundamental frequency of 450HZ, what is the frequency of the fifth overtone?
A2700Hz
B456Hz
C444Hz
D75Hz
View Explanation & Discuss
Question 424
jamb2013
What is the velocity of sound at 100 oC if the velocity of sound at 0 oC is 340ms -1?
A497m-1
B440m-1
C397m-1
D240m-1
View Explanation & Discuss
Question 425
jamb2013
A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their
Afrequency
Bamplitude
Cdirection of vibration of the particles of the medium
Dperiod of vibration of the particles of the medium
View Explanation & Discuss
Question 426
jamb2013
A wave that travels through stretched strings is known as
Aelectromagnetic wave
Bmicro wave
Cmechanical wave
Dseismic wave
View Explanation & Discuss
Question 427
jamb2013
The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is
Acovection
Bconduction
Cradiation
Ddiffusion
View Explanation & Discuss
Question 428
jamb2013
The rise or fall of a liquid in a narrow tube is because of the
Aviscosity of the liquid
Bsurface tension of the liquid
Cfriction between the walls of the tube and the liquid
Dosmotic pressure of the liquid
View Explanation & Discuss
Question 429
jamb2013
What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?
AIt will be more than 100 oC
BIt will be last than 100 oC
CIt will still be at 100 oC
DIt will be fluctuating
View Explanation & Discuss
Question 430
jamb2013
Steam from boiling water causes more damage on the skin than does boiling water because
Awater has a high specific heat
Bsteam has latent heat of fusion
Cthe steam is at a highter temperature than the water
Dsteam brings heat more easily by convection
View Explanation & Discuss
Question 431
jamb2013
Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is
A2:1
B1:2
C4:1
D1:4
View Explanation & Discuss
Question 432
jamb2013
A gas at a pressure of 105Nm-2expands from 0.6m-3 to 1.2m3 at constant temperature, the work done is
A7.0 x 106J
B6.0 x 10 6J
C6.0 x 10 5J
D6.0 x 10 4J
View Explanation & Discuss
Question 433
jamb2013
A wire of length 100.0m at 30o has linear expansive of 2x10-5K-1 Calculate the length of the wire at a temperature of - 10oC
A100.08m
B100.04m
C99.96m
D99.92m
View Explanation & Discuss
Question 434
jamb2013
Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart
A20mm
B30mm
C60mm
D80mm
View Explanation & Discuss
Question 435
jamb2013
What volume of alcohol will have same mass as 4.2m-3 of petrol?
Density of alcohol = 8.4 x 10^2 kgm-3, density of petrol =7.2x10^2 kgm-3
A0.8m3
B1.4m3
C3.6m3
D49.m3
View Explanation & Discuss
Question 436
jamb2013
Calculate the work done when a force of 20N stretches a spring by 50mm.
A0.5J
B1.5J
C2.0J
D2.5J
View Explanation & Discuss
Question 437
jamb2013
If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is
A2.2.5 x 10 5js-1
B2.5 x 104js-1
C3.3 x 103js-1
D3.3 x 102js-1
View Explanation & Discuss
Question 438
jamb2013
An object is moving with a velocity of 5m-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
A25.0m
B20.0m
C1.3m
D1.0m
View Explanation & Discuss
Question 439
jamb2013
A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?
[Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
A0.8
B0.5
C0.2
D0.1
View Explanation & Discuss
Question 440
jamb2013
Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.
