Find the L.C.M. of the following numbers in which one number is the factor of other: (a) 5,20 (b) 6,18 (c) 12,48 (d) 9,45 What do you observe in the result obtained?
(a) L.C.M of 5 and 20 = 2 – 2 – 5 = 20 (b) L.C.M of 6 and 18... View Article
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How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10ms-2..
Answer: Given parameters Mass of the dumbbell (m) = 10 kg Distance covered by the dumbbell (s) = 80 cm... View Article
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Answer: In Physics, force is defined as the push or pull on an object with mass that causes it to... View Article
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Given A 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the... View Article
A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0ms-2 for 8.0s. How far does the boat travel during this time?
Given that The initial velocity of a motorboat, u = 0 Acceleration of motorboat, a=3.0ms-2 Time under consideration or time... View Article
How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.
Answer: A solenoid is a coil with a length greater than its diameter and is a type of electromagnet to... View Article
In the given figure, the angle measure 30—‹. Look at the same figure through a magnifying glass. Does the angle become larger? Does the size of the anglechange?
26.No, the measure of angle will became.
What changes would you incorporate in your life-style in a move towards a sustainable use of our resources?
One should incorporate the following changes in life-style in a move towards sustainable use of our resources: Stop cutting trees... View Article
Which of the following describes the bonds in PCl5 ? a) 2 axial and 3 equatorial b) 3 axial and 2 equatorial c) 4 axial and 5 equatorial d) 5 axial and 4 equatorial
2 axial and 3 equatorial Geometry of PCl5 In PCl5, there are three equatorial bonds and two axial bonds. The... View Article
Which of the following materials fall in the category of a pure substance? (a) Ice (b) Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (h) Wood (i)Air
A pure substance does not have any other substance or impurity present and cannot be separated into other kinds of... View Article
In an election, the successful candidate registered 5,77,500 votes and his nearest rival secured 3,48,700 votes. By what margin did the successful candidate win the election?
Given that The number of votes secured by a successful candidate = 5,77,500 votes. Number of secured by his nearest... View Article
One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.
A point on the object needs only two rays to form an image. Since the entire lens is not covered,... View Article
Which of the following pairs is correctly matched? a) Gir forests: Gujarat b) Bandipur national park: Kerala c) Khasi hills: Arunachal Pradesh d) Nilgiri biosphere reserve: Karnataka
Gir forests: Gujarat The Gir National park Gir National Park in Gujarat is the only place in the world where... View Article
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.) A) mass B) speed C) velocity D) momentum
(C) velocity and (D) momentum Each moving charged particle in a magnetic field experiences a force. Fleming’s left-hand rule gives... View Article
Match the items (a) 35 – Multiple of 8 (b) 15 – Multiple of 7 (c) 16 – Multiple of 70 (d) 20 – Factor of 30 (e) 25 – Factor of 50
(a) 35 – 7 × 5 – multiple of 7 (b) 15 – 15 × 5 – factors of 30... View Article
Indicate the type of climate of the following areas: (a) Jammu and Kashmir: ________ (b) Kerala: _________ (c) Rajasthan: _________ (d) North-east India: _________
a) Jammu and Kashmir: Moderate climate Ladakh is a cold desert with extreme temperatures, and Jammu is a sub-tropical region... View Article
Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens): (a) 439 + 334 + 4317 (b) 1,08,734 – 47,599 (c) 8325 – 491 (d) 4,89,348 – 48,365
We have to round off the numbers to their nearest hundred and tens and then add it and find the... View Article
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Trait B seems to have arisen earlier as it is present in a larger fraction of the population. Explanation Trait... View Article
In order to meet the ever-increasing demand in factories and for shelter, trees are being continually cut. Is it justified to cut trees for such projects? Discuss and prepare a brief report.
No. It is not at all justified to cut trees to meet the ever-increasing demands of the human population. Forests... View Article
A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m/s.
Answer: For a sound wave, Speed = Wavelength x Frequency ν = λ x f Given that the speed of... View Article
