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A bullet of mass 10 g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.

Answer: Given parameters, Initial velocity (u) = 150 m/s Final velocity (v) = 0 (since the bullet finally comes to rest) Time taken to come to... View Article

A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force (b) the acceleration of the train (c)the force of wagon 1 on wagon 2.

Answer: Given parameters Mass of the engine (M) = 8000 kg Number of wagons = 5 Mass of the wagons (m) = 2000 kg Force exerted by the engine... View Article

Which of the following correctly represents the order of trophic levels? i) Producer, Primary consumer, Secondary consumer, Tertiary consumer ii) Primary consumer, Secondary consumer, Tertiary consumer iii) Producer, Secondary consumer, Primary consumer, Tertiary consumer iv) None of the above

Producer, Primary consumer, Secondary consumer, Tertiary consumer... View Article

Which of the following is a characteristic of living things? a. Living organisms are highly organized, coordinated structures that consist of one or more cells b. Living things respond to diverese stimuli c. All organisms use a source of energy for their metabolic activities. d. All of the above

All of these... View Article

Which of the following is not a feature shown by sponges? i) Sponges lack tissues and body symmetry. ii) Sponges belong to phylum Porifera. iii) Sponges are mainly found in marine habitats, but some may also be found in freshwater bodies. iv) Swimming is possible for the sponge larvae as they have cilia.

The correct option is: iii) Sponges are mainly found in marine habitats, but some may also be found in freshwater bodies.... View Article

Identify the right option describing the seeds present in Gymnosperms. i) The root system of gymnosperms is very complex. ii) In Gymnosperms, seeds are naked and not enclosed in seeds. iii) The gymosperms can survive habitats which includes marine too. iv) The fruits of the gymosperms are developed from the seeds.

In Gymnosperms, seeds are naked and not enclosed in seeds... View Article

Which of the following is not a property of a gas? i) The gases have very high compressibility. On applying pressure, gas molecules come closer and decreases the volume of a gas. ii) Gases can expand to fill the containers. iii) Gases have a specific shape or volume. iv) They are less denser than solids or liquids.

Option (iii) Gases have a specific shape or volume. The gases have very high compressibility. On applying pressure, gas molecules come closer... View Article

Choose the option that does not describe the property of a metallic solids: i) Metallic solids are good conductors of electricity. ii) There are metallic bonds present in these atoms that are holding them together. iii) Metallic solids can have high melting points. iv) Metalic solid is not a subcategory of crystalline solid

The correct option is iv) Metalic solid is not a subcategory of crystalline solid... View Article

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be €“ Option A: 1:2 Option B: 2:1 Option C: 1:4 Option D: 4:1

The correct answer is option C 1:4 Answer Heat produced in the circuit is inversely proportional to the resistance R. Let RS be the equivalent... View Article

Choose the property which is not applicable to an element: i) Atomic radius decreases from left to right ii) Electronegativity decreases from top to bottom iii) Element is a pure substance which cannot be broken down into two or more simpler substances by any physical or chemical process iv) Electronegativity increases from left to right

Element is a pure substance which cannot be broken down into two or more simpler substances by any physical or chemical process.... View Article

Investigate: Use strip and fasteners to make a triangle and a quadrilateral. Try to push inward at any one vertex of the triangle. Do the same to the quadrilateral. Is the triangle distorted? Is the quadrilateral distorted? Is the triangle rigid? Why is it that structures like electric towers make use of triangular shapes and not quadrilateral?

O is common to both the angles ˆ AOC and ˆ BOC. No, the triangle is not distorted but the quadrilateral is distorted and also the triangle is... View Article

A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will a. keep oscillating with old time period b.keep oscillating with smaller time period c.keep oscillating with larger time period d.come to rest rapidly

A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the... View Article

Choose the correct option from the below about food chain: i) The flow of energy is not unidirectional in food chain. ii) The size of any food chain is usually restricted to 3-5 trophic levels. iii) For food chains to sustain, the inorganic nutrients must keep circulating. iv) As the trophic levels increases, the size of the population decreases.

In a food chain energy is always transferred from one trophic level to the next one i.e. from 1st trophic level to 2nd trophic level and in same... View Article

Which of the following is not a characteristic of hypogeal germination? i) In hypogeal germination the cotyledons are not pushed above the ground. ii) The epicotyl is the upper portion of the axis of the seedling. iii) Pea, mango, and rice are the examples of hypogeal germination. iv) The portion between the cotyledons and the radicle is known as hypocotyl.

In hypogeal germination the cotyledons are not pushed above the ground.... View Article

Choose the correct option from the below about biodegradable substance: i) Bio degradable substances are easily decomposed by microorganisms and thus can easily mix into the soil again after a short interval of time. ii) They are not capable pf maintaining a good mechanical integrity unless its completely degraded. iii) They are non-toxic in nature. iv) All compostable is always biodegradable but all biodegradable is not compostable.

The correct option is iii) They are non-toxic in nature.... View Article

23 December 2019: PIB Summary & Analysis

Read the daily PIB update and stay up-to-date on current affairs for the UPSC exam. December 23rd, 2019 PIB:- Download PDF Here TABLE OF... View Article

Gist of EPW December Week 2, 2019

The Economic and Political Weekly (EPW) is an important source of study material for IAS, especially for the current affairs segment. In this... View Article

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