4. Liquid X floats on water in a U-tube of uniform cross-sectional area. If the density of water is 1000 kg m-3, what is the density of liquid X? A 900 kg m-3 B 1000 kg m-3 C 1500 kg m-3 D 500 kg m-3 5. Which of the following can be formed by a converging lens? Virtual, inverted and A B Virtual, upright and magnified diminished image. image. Real, upright and magnified Real, upright and diminished C D image. image. 6. Which statement best represents heat as a form of energy? It needs a medium It transfers from one location A B to another C Its magnitude depends on its D it is transferred from a high density pressure region to a low pressure region 7. What happens to the pressure of water flowing from a pipe of narrow diameter to a wider diameter? A Pressure increases B Cannot be determined C Pressure decreases D Pressure does not change