A car moving with a speed of $90 km h^{-1}$ ' was brought uniformly to rest by the application of the brakes in 10s. How far did the car travel after the brakes were applied?

A stone of mass in kg is held h meters above the floor for 50s. The work done in joules over this period is

The pressure of a gas when cooled at constant volume will decrease because the molecules

 1 kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss (Specific heat capacity of copper = $400 J kg^{-1}K^{-1}$ and latent heat of fusion of ice = $333 \times 10^{3}Jkg^{-1}$ )

 A boy looks at the image of an object in a plane mirror He observes two images a main bright one and the other faint. The observed images result from

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5 g of material?

Which of the following are TRUE for a-decay i.Mass number decreases by four, ii. Atomic number decreases by two, iii. Mass number does not change.

When an atom loses or gains a charge, it becomes

Which of the following obeys Ohm's Laws?

The saturated vapour pressure of a liquid increases as the

 How long does it take a 750W heater to raise the • temperature of 1 kg of water from 20°C to 50°C? (Specific heat capacity of water = $4200Jkg^{-1}k^{-1}$)

Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

A note is the octave of another note if it has

A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and day-time temperature are 10°C

and 35°C respectively. the linear expansivity of steel is $0.000012C^{-1}$

If a plastic sphere floats in water (density = 1000kgm$^{-3}$ ) with 0.5 of its volume submerged and floats in oil with 0.4 of its volume submerged, the density of the oil is

How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390J$kg^{-1}K^{-1}$ is heated from 20°C to 70°C?

200g of water at 90°C is mixed with 100g of water at 30°C What is the final temperature?

A plane inclined at angle $θ$ has a velocity ratio of 10:1. The inclination of the plane to the horizontal is given by

A plane progressive wave is represented by the equation: y = 2 sin (400 1 - 0.3x). What is the frequency of the wave?

A uniform metre rule is pivoted at the 60cm mark. If a mass of 30g is hung at the 20cm mark, calculate the mass which must be hung at the 85cm mark to balance the metre rule horizontally.

A current of 2A passes through a heater of resistance 3ohms for 4 minutes to melt a certain mass of ice at 0°C, Calculate the mass of the ice. [specific latent heat of fusion of ice = 336J$g^{-1}$ ].

A body performing simple harmonic motion has a frequency of 10Hz and an amplitude of 50Hz and an amplitude of 5cm. Calculate its velocity at a distance of 4cm from the centre of oscillation. [$\pi$ = 3.14].

The energy source associated with global warming in

80 coulombs of charge pass through a circuit in 1/6 of a minute. Calculate the current passing through the circuit

The speed of sound (I.) decreases with increase in temperature (II.) Is affected by wind directed (III.) Varies from one medium to another. Which of the statements above is/are correct?

The magnitude of the force on a straight current carring conductor in a magnitude field is I. proportional to the angle between the conductor and field II. Inversely proportional to the field strength III. Proportional to the current passing through the conductor. Which of the statementsabove is/are correct?

The scientist that explained the line spectra of an atom was

Grease is used as a lubricant due to it`s

A body moving with an initial velocity of 20m/s accelerates uniformly at a rate of 40m/s. What is the distance covered during this period?