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A body of mass m moving along a straight line covers half the distance with a speed of 2ms^-1. The remaining half of the distance is covered in two equal time intervals with a speed of 3 ms^-1 and 5 ms^-1 respectively. The average speed of the particle for the entire journey is (A) 3/8 ms^-1 (B) 8/3 ms^-1 (C) 4/3 ms^-1 (D) 16/3 ms^-1

Let the total distance travelled by the body = 2S If t1 is the time taken by the body to travel first half of the distance, then t1 = S/2 For... View Article

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s. Calculate the power rating of the pump if its efficiency is 40% (A) 100k W (B) 40k W (C) 16k W (D) None of the above

Force = m x g F = 500 x 10 = 5000 N Work = F x s W = 5000 x 80 We get, W = 4 x 105 Joule Power = Work/Time On substituting, we get, Power... View Article

Electrode potential of hydrogen electrode is 18 mv then [H^+] is: (A) 0.2 (B) 1 (C) 2 (D) 5

Given [H+] =? Applying Nernst equation, 18 x 10-3 V = 0 + 0.0591 log [H+] 18 x 10-3 V = 0.0591 log [H+] We get, log [H+] = 0.3046... View Article

Distinguish between desire and demand

Desire 1. Desire simply refers to the mere wish of a person to have a particular commodity, irrespective of the fact whether one can buy it or... View Article

A refrigerator whose coefficient of performance K = 5, extracts heat from the cooling compartment at the rate of 250 J/cycle. What is the work done per cycle to operate the refrigerator? How much heat is discharged per cycle to the room which acts as the high temperature reservoir? (A) 50 J (B) 200 J (C) 300 J (D) None

Work done per cycle W = Q2/K Given Q2 = 250 J On substituting, we get, W = 250/5 W = 50 J Hence, 50 J of work is needed to be done per cycle... View Article

A 100 mL solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is: (a) 70 mL (b) 32 mL (c) 35 mL (d) 16 mL

In the neutralization of acid and base N x V of both must be equivalent N x V of HCl = 0.1 x 100 = 10 N x V of NaOH = 0.2 x 30 = 6 To obtain 10N... View Article

Which of the following secretions does not contain enzymes? (a) Bile (b) Pancreatic juice (c) Intestinal juice (d) Saliva

Bile Bile does not contain any enzymes like other secretions from the gastrointestinal tract but is very essential in the process of digestion.... View Article

Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20μC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle at A has the magnitude. (a) zero (b) 3.6 N (c) 3.6 √3 N (d) 7.2 N

zero We know that, Fnet = ma a = acceleration of the charged particle at A is zero Hence, we can say that net force will also be zero ⇒Fnet... View Article

To increase the range of a voltmeter we need to connect a suitable (A) high resistance in series (B) high resistance in parallel (C) low resistance in series (D) low resistance in parallel

High resistance in series The range of the voltmeter can be increased by increasing the resistance. This can be done by connecting a resistor in... View Article

The direction of acceleration due to gravity is always vertically downward. State whether true or false (A) True (B) False

True Acceleration due to gravity (g = 9.8 m/s2)always acts in the downward direction. Therefore, the given statement is true So, the correct... View Article

In soil, water available to plants roots is (a) Hygroscopic water (b) Capillary water (c) Gravitation water (d) Colloid water

Capillary water The water present in narrow soil spaces is called capillary water, available to plant roots for absorption. It is found in... View Article

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Archives

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s. Calculate the power rating of the pump if its efficiency is 40% (A) 100k W (B) 40k W (C) 16k W (D) None of the above

Electrode potential of hydrogen electrode is 18 mv then [H^+] is: (A) 0.2 (B) 1 (C) 2 (D) 5

Distinguish between desire and demand

A 100 mL solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is: (a) 70 mL (b) 32 mL (c) 35 mL (d) 16 mL

Which of the following secretions does not contain enzymes? (a) Bile (b) Pancreatic juice (c) Intestinal juice (d) Saliva

To increase the range of a voltmeter we need to connect a suitable (A) high resistance in series (B) high resistance in parallel (C) low resistance in series (D) low resistance in parallel

The direction of acceleration due to gravity is always vertically downward. State whether true or false (A) True (B) False

The additive inverse of 17 is (A) -17 (B) 17 (C) 1/17 (D) -1/17

Inflating a balloon seems to violate Boyle’s law. Why?

State three differences between water and air

How do you find the exact value of cos (-2π/3)?

Turpentine oil in paints is used as a (a) Thinner (b) Vehicle (c) Base (d) Drier

Find out the wrong term 3, 2, 8, 9, 13, 22, 18, 32, 23, 42 (a) 8 (b) 9 (c) 13 (d) 22

What was the life expectancy in India during British rule? (a) 30 years (b) 32 years (c) 35 years (d) 40 years

State the main function of lymphocytes

Newtons law of cooling is a special case of (a) Kirchoff’s law (b) Weins law (c) Stefan-Boltzmanns law (d) Plancks law

In soil, water available to plants roots is (a) Hygroscopic water (b) Capillary water (c) Gravitation water (d) Colloid water

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