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Which of the following comparisons of the two birth control methods used by women are correct?

Which one of these is true about motion?

AMotion of the earth is about its axis rotational.
BMotion of a drawer of a table is periodic.
CMotion of an object is not relative.
DMotion of the wheel of a bicycle is periodic.

Avin tied a small stone to one end of a string that he had. Then he held the other end of the string and started whirling it, initially slowly, then faster and faster. Which of the following statements is incorrect?


AThe stone always undergoes circular motion.
BThe distance of the stone from Avin's hand keeps changing.
CThe stone undergoes non-periodic motion.
DBoth B and C.

Refer to the given figure and select the correct option regarding Y and Z.


AY provides carbohydrates that are transported by Z.
BY transports water and mineral while Z transports carbohydrates.
CIf it is section of stem of plant provided with carbon dioxide (with radioactive carbon), then part Y will appear dark coloured in autoradiograph.
DY is living tissue whereas Z is lignified dead tissue.

A stone which has a mass of 12 g and a density of 3 g cm^-3, is lowered into 20 cm³ of water in a measuring cylinder. What will be the new reading on the measuring cylinder?

A 20 cm³
B 24 cm³
C 40 cm³
D 16 cm³

An air conditioner is rated 240 V, 1.5 kW. The air conditioner is switched on for 8 hours each day. How much electrical energy is consumed in 30 days?

A 360 kW h
B 8.64 kW h
C 120 kW h
D 240 kW h

Which of the following statements are incorrect?
(i) A bag placed below the seat of a moving bus is in motion with respect to the floor of the bus.
(ii) While measuring length of an object using a metre scale, use the zero-mark even if the ends are worn out.
(iii) Blinking of eyes is an example of periodic motion.
(iv) If a body as a whole moves around in a circular path, the motion is known as revolution.

A(i), (ii) and (iv) only
B(i), (ii) and (iii) only
C(ii), (iii) and (iv) only
D(i), (iii) and (iv) only

Nisha and Neha were playing together on a street where they accidentally collided with each other and fell down. After that, Neha started feeling pain in her elbow and could not bent it easily. Nisha also developed discomfort in one of her wrists and had difficulty in writing. They visited doctor who told them that their joints were injured. Identify their injured joints and select the correct option regarding them.

The circuit diagram shows four different switches and some wires connected to a light bulb, an electric oven and a printer.

Which of the switches must be closed in order to have the following energy conversion only?
Chemical energy → electrical energy → kinetic and sound energy

AS₂ only
BS₁ and S₂ only
CS₁ and S₃ only
DS₁, S₂ and S₄ only

Select the incorrect match from the following.

AVenus - Called morning or evening star
BSaturn - Its rings are made of ice, rocks and dust
CJupiter - Largest and fastest spinning planet
DMercury - Hottest planet