An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.
A1.0cm
B1.5cm
C2.0cm
D2.5cm
View Explanation & Discuss
Question 32
jamb1994
An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?
A5cm
B10cm
C30cm
D40cm
View Explanation & Discuss
Question 33
jamb1994
Light of frequency 6.0 x 10\(^{14}\) Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass
A4.0 x 1014Hz
B6.0 x 1014Hz
C7.5 x 1014Hz
D9.0 x 1014Hz
View Explanation & Discuss
Question 34
jamb1994
To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to
Athe focal length
Btwo times the focal length
Cthe distance of the image
Dtwo times the radius of curvature
View Explanation & Discuss
Question 35
jamb1994
The note produced by a stretched string has a fundamental frequency of 400Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is
A200Hz
B400Hz
C800Hz
D1600Hz
View Explanation & Discuss
Question 36
jamb1994
A pipe of length 45cm is closed at the end. Calculate the fundamental frequency of the sound wave generated in the pipe if the velocity of sound in air is 360ms-1 [Neglect end correction]
A5.5Hz
B148.5Hz
C200.0Hz
D550.0Hz
View Explanation & Discuss
Question 37
jamb1994
The fundamental frequency of vibration of a sonometer wire may be halved by
Adoubling the length of the wire
Bdoubling the mass of the wire
Creducing the tension by half
Dreducing the absolute temperature by half
View Explanation & Discuss
Question 38
jamb1994
The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms-1 the depth of the sea is
A6000m
B3000m
C1500m
D375m
View Explanation & Discuss
Question 39
jamb1994
The equation of transverse wave traveling along a string is given by Y = 0.3 sin(0.5x - 50t) where Y and X are in cm and t is in seconds.Find the maximum displacement of the particles from the equilibrium position
A50.0cm
B2.5 cm
C0.5cm
D0.3cm
View Explanation & Discuss
Question 40
jamb1994
Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct
AThe two kettles will cool down at the same rate
Bthe polished kettle cools down more quickly by conduction
Cthe kettle covered with soot cools down more quickly because it is a good radiator
Dthe kettle covered with soot cools down more quickly by the process of heat convection
View Explanation & Discuss
Question 41
jamb1994
If a room is saturated with water vapour, the temperature of the room must be
Aat 0oC
Babove the dew point
Cat 100oC
Dbelow or at the dew point
View Explanation & Discuss
Question 42
jamb1994
Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg-1]
A336W
B450W
C560W
D600W
View Explanation & Discuss
Question 43
jamb1994
When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x
A50g
B100g
C150g
D200g
View Explanation & Discuss
Question 44
jamb1994
A Motor Tyre is inflated to pressure of 2.0 x 105Nm-2 when the temperature of air is 27oC. What will be the pressure in it at 87oC assuming that the volume of the Tyre does not change?
A2.6 x 105Nm-2
B2.4 x 105Nm-2
C2.2 x 105Nm-2
D1.3 x 105Nm-2
View Explanation & Discuss
Question 45
jamb1994
The melting point of naphthalene is 78oC. What is this temperature in kelvin
A100k
B351k
C378k
D444k
View Explanation & Discuss
Question 46
jamb1994
If a solid X floats in liquids P of relative density 2.0 and in liquid Q of relative density 1.5, it can be inferred that the
Aweight of P displaced is greater than that of Q
Bweight of P displaced is less than that of Q
Cvolume of P displaced is greater than that of Q
Dvolume of P displaced is less than that of Q
View Explanation & Discuss
Question 47
jamb1994
The mass of a specific gravity bottle is 15.2g when it is empty. it is 24.8g when filled with kerosene and 27.2g when filled with distilled water. Calculate the relative density of kerosene
A1.25
B1.10
C0.90
D0.80
View Explanation & Discuss
Question 48
jamb1994
Which of these statements are TRUE of pressure in liquids? i. pressure acts equally in all direction. ii. pressure decreases with depth. iii. pressure at the same level of a liquid is the same. iv pressure is dependent on the cross-sectional area of the barometer tube
Ai, iii only
Bi, ii, iii only
Ci, iii, and iv only
Di, ii, iii and iv
View Explanation & Discuss
Question 49
jamb1994
A force of 15N stretches a spring to a total length of 30cm. An additional force of 10N stretches the spring 5cm further. Find the natural length of the spring
A25.0cm
B22.5cm
C20.0cm
D15.0cm
View Explanation & Discuss
Question 50
jamb1994
Calculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm
