Light, Shadows And Reflections

Short Q&A:

Q1: What is the difference between transparent and translucent object?

Q2: What materials can be used to make a pinhole camera? How can it be used?

Q3: Why is shadow formed when an opaque object comes in path of light?

erQ4: What is reflection

Q5: Classify the objects as opaque, transparent and translucent-
Fog, glass, wood, plastic box, smoke, water

Q6: Why we cannot see our image in the mirror in complete dark room?

Q7: Classify the following as luminous and non luminous object:
Sun, moon, table, chair, stars

Q8: What is the difference between luminous and non luminous objects?

Q9: Why we cannot see objects through T shaped or N shaped pipe?

Q10: What do we need to see an object?

Q11: Give example of an object which is

 a) opaque and luminous

 b) translucent and luminous.

Q12: If moon is non luminous, how it appears bright in night?

Q13: What type of objects does not cast shadow and why is that?

Q14: Why polished surface cause glares in our eyes?

Q15: Give two examples of each:

a) Transparent and non luminous object
b) Translucent and non luminous object.

Q16: Which of these object can cast shadow:
Paper, air, rock, glass, sun

Q17: How is shadow formed?

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Q1: Give two examples of mode of transport used on land.

Q2: What do you mean by term ‘measurement’?

Q3: The known fixed quantity of measurement is called __________.

Q4: What is the full form of SI units?

Q5: Give two example of each mode of transport used on water and air.

Q6: What is SI unit of length?

Q7: The result of any measurement is expressed in two parts. One part is number and other part is ______.

Q8: In ancient India small length measurement used were angul and mutthi.(TRUE/FALSE)

Q9: The system of unit of measurement used now days is ___________.

Q10: What is motion?

Q11: 1 metre is equal to __cm.

Q12: We can measure length of a curved line directly by using a metre scale.(TRUE/FALSE)

Q13: What are different types of motion?

Q14: When objects move along a straight line such motion is called ______ motion.

Q15: One centimetre is equal to _______millimetre.

Q16: When an object moves in a circular path, such motion is called _________.

Q17: Give two example of periodic motion.

Q18: One kilometre is equal to __________ metre.

Q19: We can use __________ to measure length of a curved line.

Q20: A sprinter in 100m race move along a straight track. This type of motion is called _________.

Q21: Give an example of circular motion.

Q22: Strings of guitar being played are in __________motion.

Q23: In periodic motion, object repeats its motion. (TRUE/FALSE)

Q24: Hands of clock are example of_________ motion.

Q25: What is periodic motion?

Q26: 8 km is equal to ___m.

Q27: The length of a rope is 5m.Express it in cm.

Q28: If a child is moving on swing, its motion is __________.

Q29: 10 centimetres is equal to __________mm.

Q30: A ball is rolling on the ground, rotating as well as moving forward on the ground. Therefore it undergoes _____________ and ___________ motion.

Q31: If the person is walking along a straight road, its motion is _____________.

Q32: Motion of falling stone is __________.

Q33: How many millimetres are there in 20 centimetres?

Q34: Rekha took one metre rope. She wants to know the length of rope in cm and mm. Answer.

Q35: km is equal to _________m and ________cm.

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