Question 99 X-rays can be used
A> for cutting and welding of metalsB> to detect heart diseases.
C> to detect defects in precious stones and diamonds.
D> to detect gold under the earth.
Answer: to detect defects in precious stones and diamonds.
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Question 100 Ice is packed in saw dust because
A> saw dust will not get melted easily.B> saw dust is poor conductor of heat.
C> saw dust is a good conductor of heat.
D> saw dust does not stick to the ice.
Answer: saw dust is poor conductor of heat.
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