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Swali 1 Ripoti
A sound wave from a ship is received 8.4s later. What is the depth of the sea? [Speed of sound in water 1500ms-1]
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Swali 2 Ripoti
Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg-1 . Specific heat capacity of water 4.2Jg-1 K-1]
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Swali 3 Ripoti
A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.
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Swali 4 Ripoti
Which of the following cells does not require a dipolar for effective and efficient delivery of current?
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Swali 6 Ripoti
An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms-1]
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Swali 7 Ripoti
An object of mass 2kg moves for 5s with a uniform velocity of 10ms. What is the magnitude of its acceleration in ms-2
?
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Swali 8 Ripoti
Which of the following phenomena is responsible for the spherical shape of soap bubbles?
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Swali 9 Ripoti
A ball of mass 100g falls from a height of 5m onto a concrete floor and rebounds to a height of 3m. Calculate the energy lost. (g = 10ms-2)
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Swali 10 Ripoti
Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?
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Swali 11 Ripoti
A body executing simple harmonic motion has an angular speed of 2π radians. Its period of oscillation is (π 3.14).
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Swali 12 Ripoti
The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by
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Swali 13 Ripoti
The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth?
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Swali 14 Ripoti
A stone is thrown with a speed of 10ms at an angle of 30° to the horizontal, Calculate its time of flight, (g = 10ms2)
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Swali 15 Ripoti
Arrange the following in the order of their increasing frequency.
I. Visible light
II. Gamma rays
III. Radio waves
IV. Infra-red radiation
V. Ultra-violet radiation
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Swali 16 Ripoti
A ball of mass 0.1kg moving with velocity of 20ms-1 is hit by a force which acts on it for 0.02s. If the ball moves off in the opposite direction with a velocity of 25ms-1 , calculate the magnitude of the force.
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Swali 17 Ripoti
A plane progressive wave is represented by the equation y = 0.2sin (200πt - 0.5.x) where x and y are measured in cm and t in s. What is the frequency of the wave?
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Swali 18 Ripoti
When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is
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Swali 19 Ripoti
Determine the value of x from the nuclear reaction below,
\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy
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Swali 20 Ripoti
An immersion heater is rated 1500W. How long does it take the heater to raise the temperature of 1 kg of water by 30°C? (Assume heat lost to the surrounding is negligible, Specific heat capacity of water 4200Jkg-1K-1)
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Swali 21 Ripoti
In the electrical method of making a magnet, the polar the magnet formed depends on the
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Swali 22 Ripoti
Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then
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Swali 24 Ripoti
Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is
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Swali 25 Ripoti
A projectile attains its maximum height when the angle of projection is
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Swali 27 Ripoti
The defect of the eye lens which occurs as a result of weak ciliary muscles is called
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Swali 28 Ripoti
Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.
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Swali 30 Ripoti
Which of the following statements is correct about volatile liquids? They have
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Swali 31 Ripoti
Which of the following statements about the pressure in a liquid is NOT correct? It
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Swali 35 Ripoti
The phenomenon of photoelectric effect is used in the following EXCEPT
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Swali 36 Ripoti
Which of the following pairs of musical instruments produce sound due to the vibration of air column?
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Swali 37 Ripoti
Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane?
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Swali 38 Ripoti
The electric potential at a distance d from a point charge q in air of permittivity eo is expressed as?
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Swali 39 Ripoti
Two forces of magnitude 8N and 4N act at right angle to each other. The angle between the resultant and the 8N force is
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Swali 42 Ripoti
Which of the following statements is correct about light and sound waves? Both
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Swali 43 Ripoti
An effort P applied at one end of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as
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Swali 44 Ripoti
The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.
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Swali 45 Ripoti
Two images Y and X are formed by a plane mirror and a convex mirror respectively. Which of the following is correct about their characteristics?
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Je, ungependa kuendelea na hatua hii?