Question

`CCT-3SUBJECT- SCIENCECLASS-VIITOPIC - MOTION AND TIMECONCEPT-SPEEDTwo buses A and B started their journey from Belapur the place where Manish and his friendlive. Manish was sitting in bus A and his friend was sitting in bus B.Manish found that bus A travelled60 km in 2 hours and his friend found that bus B travelled 72 km in 3 hours.Both Manish and hisfriend reached their homes after completed their journey.On next day Manish and his friendstarted their journey in a car at 8 AM.On the way Manish and his friend noted distance covered bycar at 8:30 AM 9:00 AM 9:30 AM and at 10 AM.Time8:30 AM9:00 AM9:30 AMDistance20 KM40 KM60 KMA graph between distance covered by car and time was given below.10 AM80 KM8060Distance 40in km208 AM8:30 AM9:00 AM9:30 AM10 AMTime in hoursQuestion 1: Which of the following is correct?a) Bus A moves faster than bus B.b) Bus B moves faster than Bus A.c) Bus A and bus B moves with same speed.d) Can not decide which is fasterQuestion 2: What can you say about speed from the graph ?a) Covers unequal distances in equal intervals of time.b) Car is moving with uniform speed.c) Car is moving with non-uniform speed.d) Car is moving with variable speed.Question 3. Which of the following is correct?a) Speed = distance/timeb) Speed = time/distancec) Speed= distance X timed) Distance= speed/timeQuestion 4. What is the speed of the car ?a) 30 km/hb) 35 km/hc) 40 km/hd) 45 km/h​

Answer 1

Answer:

Phloem is responsible for transportation of food. Phloem is composed of sieve tubes, companion cells, phloem parenchyma and bast fibres. Sieve tubes are the conducting elements in phloem.

Answer 2

Explanation:

Acid, any substance that in water solution tastes sour, changes the colour of certain indicators (e.g., reddens blue litmus paper), reacts with some metals (e.g., iron) to liberate hydrogen, reacts with bases to form salts, and promotes certain chemical reactions (acid catalysis).