A balloon containing 546cm3 of air is heated from 0oC to 10oC. If the pressure is kept constant, what will be its volume at 10oC?
A526cm3
B546cm3
C556cm
D566cm3
E819cm3
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Question 752
waec1995
A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105NC-1. What is the magnitude of the electric force exerted on the charge?
A3.2 x105N
B1.8 x105N
C3.2 x10-5N
D1.8 x10-5N
E4.0X10-6N
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Question 753
waec1995
What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)
A2GR
B2G/R
C2GR2
D\(\sqrt{\frac{2GM}{R}}\)
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Question 754
waec1995
A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with a different.
Afrequencies
Bpitches
Cloudness
Dintensities
Eovertones
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Question 755
waec1995
An alternating voltage with a frequency of 50Hz has a period of
A0.02s
B0.05s
C0.20s
D0.50 s
E50.00s
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Question 756
waec1995
The period of a wave is 0.02 second. Calculate its wavelength if its speed is 330 ms-1
A6.6m
B5.0m
C4.0m
D3.3m
E2.0m
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Question 757
waec1995
A sound note of frequency 250 Hz and wavelength 1.3m is produced at a point near a hill. If the echo of the sound is received 1 second later at the point, how far away is the hill from the point?
A131.3m
B162.5m
C248.7m
D251.3m
E325.0m.
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Question 758
waec1995
Which of the following wave characteristics can be used to distinguish a transverse wave from a longitudinal wave?
AReflection
BRefraction
CDiffraction
DPolarization
EInterference
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Question 759
waec1995
Which of the following media allow(s) the transmission of sound wave through them? I. Air II. Liquid III. Solid.
AI only
BII only
CIII only
DI and II only
EI, II and III.
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Question 760
waec1995
Sixty complete waves pass a particular point in 4s. lf the distance between three successive troughs of the waves is 15m, calculate the speed of the waves,
A300.0ms-1
B225.0ms-1
C112.5ms-1
D75.0ms-1
E16.0ms-1
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Question 761
waec1995
A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms-1, what is the minimum frequency which will resonate with the wire?
A50 Hz
B75 Hz
C100 Hz
D150 Hz
E200 Hz
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Question 762
waec1995
An object is placed on the principal axis at the centre of curvature of a concave mirror. The image of the object formed by the mirror is
Areal, inverted and magnified
Bat the principal focus
Creal and diminished
Derect and virtual
Eat the centre of curvature
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Question 763
waec1995
Which of the following is not self-luminous?
AIncandescent electric bulb
BIncandescent fluorescent tube
CLighted candle
DThe moon
EThe sun
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Question 764
waec1995
The image of any real object formed by a diverging lens is always
Ainverted
Bmagnified
Cerect
Dreal
Ethe same size as the object
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Question 765
waec1995
Light travels in straight lines. In which of the following is this principle manifested? I. Pinhole camera II Formation of shadows III. Diffraction of light IV. Occurrence of eclipse
AI and III only
BII and III only
CI, II and III only
DI, II and IV only
EI, II, III and IV
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Question 766
waec1995
A ray of light is incident on a body x as shown in the diagram above. What is the refractive index of the body?
A1.63
B1.50
C1.49
D1.33
E1.02
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Question 767
waec1995
A ray of light is incident on mirror m1 and after reflection is incident on mirror m2 as shown in the diagram, calculate the angle of reflection of the ray at mirror m2
A120o
B90o
C60o
D45o
E30o
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Question 768
waec1995
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that in Q. lf the masses of P and Q are the same, calculate the ratio of the specific heat capacities of Q to P.
A4 : 1
B2 : 1
C1 : 1
D1 : 2
E1 : 4.
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Question 769
waec1995
How much heat is required to convert 20 g of ice at 0oC to water at the same temperature? (Specific latent heat of ice = 336 J g-1)
A1.35 x 103J
B5.38 x 103J
C6.72 x 103J
D7.06 x 103J
E8.06 x 103J
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Question 770
waec1995
An iron rod of mass 2kg and at a temperature of 280oC is dropped into some quantity of water initially at a temperature of 30oC. lf the temperature of the mixture is 70oC, calculate the mass of the water. (Neglect heat losses to the surroundings). Specific heat capacity of iron = 460 J kgK) (Specific heat capacity of water = 4200 Jkg K)
