In 1945, Percy Spencer stumbled on the principle of a kitchen gadget by carrying chocolate into a radiation lab. He also ruined a perfect suit. Name the product.

1. 1. Toaster
   2. Electric Oven
   3. Juicer, Mixer and Grinder
   4. Microwave oven

A storage system developed by Charles Drew in 1940 enabled a particular type of banking. What was it?

1. 1. Data Banking
   2. para Banking
   3. Blood Banking
   4. Eye banking

During a total solar eclipse there is most likely to be _____.

1. 1. an increase in the rate of photosynthesis
   2. a decrease in the rate of respiration
   3. a decrease in the rate of photosynthesis
   4. no effect on either photosynthesis or respiration

When water is filled in a bottle and is allowed to freeze, the bottle breaks because _____.

1. 1. Water expands on freezing
   2. Bottle contracts at freezing point
   3. Temperature outside the bottle is less than that inside the bottle
   4. None of these

A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to _____.

1. 1. Prop him up if he falls
   2. To keep the centre of gravity always vertically above the rope
   3. Spread out his weight and reduce the pressure on the rope
   4. Add extra weight to keep the rope tightly stretched

The sky appears blue because the earths _____.

1. 1. Reflects blue light
   2. Scatters blue light
   3. Transmits blue light
   4. has actual blue cover

The property by virtue of which metals can be beaten into thin sheets is known as _____.

1. 1. Density
   2. Ductility
   3. Conductivity
   4. Malleability

Steering of a car involves _____.

1. 1. A single force
   2. A pair of forces acting along the same line and in opposite direction
   3. Two forces acting in the same direction
   4. Two forces acting along different lines and in opposite direction

Which one of the following is the main culprit in the thinning of Ozone layer in the earth’s stratosphere?

1. 1. Carbon dioxide
   2. Nitrogen oxides
   3. Chlorofluorocarbons
   4. Methane

Fuse wire is made of _____.

1. 1. 63% tin and 37% lead
   2. 63% lead and 37% tin
   3. 63% tin and 37% aluminium
   4. 63% lead and 37% aluminium