Q1: What optical tool helped humans first see tiny things that were not visible to the naked eye?
A: The microscope.
Q2: What was a curved piece of glass, thick in the middle and thin at the edge, called historically?
A: A lens.
Q1. Which force is responsible for the downward movement of parachutes? Will the person come down with the same speed without the parachute?
Answer: The downward movement of a parachute is caused by gravity (the force that pulls everything toward Earth). However, the parachute slows the fall because of air resistance (a force that pushes upward against the falling object).
A person would fall much faster without a parachute because there’s less air resistance to balance gravity’s pull. The parachute increases air resistance, making the fall slower and safer.
Q1. ____________ is a type of business unit where a person is solely responsible for providing the capital.
(a) Sole proprietorship
(b) Joint Hindu family business
(c) Partnership
(d) Cooperative societies
Case Study Based Question:
The Cake Plaza specialises in delivering a variety of traditional cakes, designer cakes, dry cakes, cookies, and more, made to order using the finest ingredients available in a wide array of tastes, colours, designs, and themes. You can have a customised cake with your message delivered to your doorstep to celebrate any event, occasion, festival, or gathering. Josephine, the owner of The Cake Plaza, resides in Delhi. She wants to expand her business to other parts of the country, but lacks the necessary funds for that. She also hopes that people from other states will learn about her delicious cakes and cookies. However, she is concerned that her shop might catch fire, as happened with one of the neighbouring shops last week.
Based on the information provided about The Cake Plaza, answer the following question: State any three business activities that Josephine will use to achieve her goal.
Q1. A solution turns the red litmus paper blue. Excess addition of which of the following solutions would reverse the change?
(i) Lime water
(ii) Baking soda
(iii) Vinegar
(iv) Common salt solution
Answer: (iii) Vinegar
Only vinegar (acetic acid) is acidic and can neutralise the base, turning the blue litmus back to red.
Infer the meaning of the following words from the context
Q1. paddling (wading in water, walking with bare feet in shallow water)
Answer: The poet describes the scene when her mother was young and she was enjoying paddling in water with her two cousins, who were holding her hands.
