A 45o triangular glass prism can be used as a reflector of light because
AA refraction never takes place in such a prism
Bthe angle of reflection equals the angle of incidence
Cthe refractive index of glass is less than 1
Dit is transparent
Ethe critival angle angle for glass is less than 45o
View Explanation & Discuss
Question 12
jamb1985
An object is placed 15cm in front of a concave mirror of radius 40cm. The image formed
Avirtual and 60cm behind the mirror
Breal and 60cm behind the mirror
Cvirtual and at infinity
Dreal and at infinity
Evirtual and 40cm from the mirror
View Explanation & Discuss
Question 13
jamb1985
If the fundamental frequency of a closed pipe organ on a day when the speed of sound is 340ms-1 is 170Hz, then the length of the pipe is
A50cm
B70cm
C100cm
D150cm
E200cm
View Explanation & Discuss
Question 14
jamb1985
When a sound wave passes from air into water its
Aspeed and frequency increases but its wavelength remains the same
Bspeed and wavelength increases but its frequency remains the same
Cspeed decreases
Dspeed remains the same but its frequency and wavelength change
Espeed increases but its frequency and wavelength decreases
View Explanation & Discuss
Question 15
jamb1985
In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms-1, what is the depth of the sea?
A0.75km
B1.50km
C2.20km
D3.00km
E3.75km
View Explanation & Discuss
Question 16
jamb1985
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
AExpansion
BConduction
CConvection
DRadiation
EEvaporation
View Explanation & Discuss
Question 17
jamb1985
Which of the following statements are NOT correct?
Aboiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
Bboth the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
Cthe saturated vapour presssure rises with increase in temperature
Dthe saturated vapour pressure is independent of the volume available for the vapour
Eit is possible to boil water at a lower temperature than 100oC at high altitude
View Explanation & Discuss
Question 18
jamb1985
A good calorimeter should be of
Alow specific heat capacity and low heat conductivity
Blow specific heat capacity and high heat conductivity
Chigh specific heat capacity and high heat conductivity
Dhigh specific heat capacity and low heat conductivity
Edull surface and low heat conductivity
View Explanation & Discuss
Question 19
jamb1985
Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is
A\(\frac{1}{4}\)
B\(\frac{1}{2}\)
C4
D1
E2
View Explanation & Discuss
Question 20
jamb1985
Water shows anomalous behaviour.
Abelow 0oC
Bbetween 0oC and 4oC
Cat exactly 4oC
Dbetween 4oC and 100oC
Eabove 100oC
View Explanation & Discuss
Question 21
jamb1985
In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is
Aforce
Bforce/m
Cwork
Dforce/m3
Eenergy/m3
View Explanation & Discuss
Question 22
jamb1985
A quantity of gas occupies a certain volume when the temperature is -73oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?
A573oC
B327oC
C300oC
D110oC
E27oC
View Explanation & Discuss
Question 23
jamb1985
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
A44oC
B50oC
C56oC
D60oC
E70oC
View Explanation & Discuss
Question 24
jamb1985
A thin aluminum plate has a surface area of 1.500m at 20ºC. What will be its surface area when it is cooled to -20ºC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).
A1.503m2
B1.500m2
C1.498m2
D1.497m2
E1.490m2
View Explanation & Discuss
Question 25
jamb1985
A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level?
A\(\frac{1}{6}\)
B\(\frac{1}{5}\)
C\(\frac{1}{3}\)
D\(\frac{4}{5}\)
E\(\frac{5}{6}\)
View Explanation & Discuss
Question 26
jamb1985
A metal cube of volume 103mm3 is lowered into a measuring cylinder containing water. If the internal cross-sectional area of the cylinder is 1.5 x 102mm2, by how much does the water level rise in the cylinder?
A6.67 x 100mm
B8.50 x 102mm
C1.15 x 103mm
D2.50 x 103mm
E1.50 x 105mm
View Explanation & Discuss
Question 27
jamb1985
The areas of the effort and load pistons of a hydraulic press are 0.5m2 and 5m2 respectively. If a force F1 of 100N is applied on the effort piston, the force F2 on the load is
A10N
B100N
C500N
D1000N
E5000N
View Explanation & Discuss
Question 28
jamb1985
Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P2. If the atmospheric pressure is equivalent to 10m of water, then the value of \( \frac{p_2}{p_1} \) is?
A0.50
B0.60
C1.67
D2.00
E3.0
View Explanation & Discuss
Question 29
jamb1985
A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string
A15cm
B12cm
C10cm
D8cm
E5cm
View Explanation & Discuss
Question 30
jamb1985
A 0.05kg bullet travelling at 500ms-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?
