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5551.

A student uses a spring balance of least count 10g wt and range 500g wt. He records the weight of small iron cube in air, in tap water and in a concentrated solution of common salt in water. If his three readings taken in this order are W1, W2 and W3, he is likely to observe that :(1) W1 > W2 > W3 (2) W3 > W2 > W1(3) W1 > W3 > W2(4) W2 > W1 > W3

Answer» A student uses a spring balance of least count 10g wt and range 500g wt. He records the weight of small iron cube in air, in tap water and in a concentrated solution of common salt in water. If his three readings taken in this order are W1, W2 and W3, he is likely to observe that :

(1) W1 > W2 > W3

(2) W3 > W2 > W1

(3) W1 > W3 > W2

(4) W2 > W1 > W3
5552.

A body covers 20m distance in 2s and 40m in next 3s. Find initial velocity and acceleration.

Answer» A body covers 20m distance in 2s and 40m in next 3s. Find initial velocity and acceleration.
5553.

A particle of mass 'm' moves on the axis of a ringof radius 'R' and mass M. If particle at rest isreleased from 'P then its kinetic energy at centrec will beMmC 3R PGMm(1)RGMm(2)2R2GMM(3)GMm(4)3RRCQRC

Answer» A particle of mass 'm' moves on the axis of a ringof radius 'R' and mass M. If particle at rest isreleased from 'P then its kinetic energy at centrec will beMmC 3R PGMm(1)RGMm(2)2R2GMM(3)GMm(4)3RRCQRC
5554.

Question 2Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure potential difference across the 12Ω resistor. What would be the readings in the ammeter and the voltmeter?

Answer»

Question 2

Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure potential difference across the 12Ω resistor. What would be the readings in the ammeter and the voltmeter?



5555.

List down the three properties for an electromagnet.

Answer» List down the three properties for an electromagnet.
5556.

A bullet of mass 50 g is fired form a stationary rifel into a wooden block of mass 1.95 kg placed on a horizontal wooden surface . on stricking, the bullet is embedded into the block and both together cover a distance of 200 m in a stright path before comeing to rest . given the coefficient of friction between the block and the surface is 0.2 and mass of the rifel form which the bullet is triggered is 14 kg, find magnitude of the velocity of the recoil of the rifel. ( neglat the rasistance of air on the bullet )

Answer» A bullet of mass 50 g is fired form a stationary rifel into a wooden block of mass 1.95 kg placed on a horizontal wooden surface . on stricking, the bullet is embedded into the block and both together cover a distance of 200 m in a stright path before comeing to rest . given the coefficient of friction between the block and the surface is 0.2 and mass of the rifel form which the bullet is triggered is 14 kg, find magnitude of the velocity of the recoil of the rifel. ( neglat the rasistance of air on the bullet )
5557.

An ice berg of density 900 Kg/m3 is floating in water of density 1000 Kg/m3. The percentage of volume of ice-cube outside the water is:

Answer»

An ice berg of density 900 Kg/m3 is floating in water of density 1000 Kg/m3. The percentage of volume of ice-cube outside the water is:


5558.

Which of the following conditions is not necessary for burning?

Answer»

Which of the following conditions is not necessary for burning?


5559.

A particle projected upward with speed v find distance travelled in t = 1.5v/g

Answer» A particle projected upward with speed v find distance travelled in t = 1.5v/g
5560.

How are potential difference (V), current (I) and resistance (R) related?

Answer»

How are potential difference (V), current (I) and resistance (R) related?


5561.

the acceleration ofa particle given by relation a=-5w^2sin(wt).at t=0,x=0and v=5w.the displacemen of the particle at time=2

Answer» the acceleration ofa particle given by relation a=-5w^2sin(wt).at t=0,x=0and v=5w.the displacemen of the particle at time=2
5562.

Due to which property of a body ,it will tend to remain in the position of rest

Answer»

Due to which property of a body ,it will tend to remain in the position of rest


5563.

an object is moving in a uniform speed in a circlular path of radius 7cm. Calculate the displacement when it completes.What type of motion it has? and calculate the distance.

Answer» an object is moving in a uniform speed in a circlular path of radius 7cm. Calculate the displacement when it completes.What type of motion it has? and calculate the distance.
5564.

(a) What are fluids ? Name two common fluids. (b) State Archimedes' principle. (c) When does an object float or sink when placed on the surface of a liquid ?

Answer»

(a) What are fluids ? Name two common fluids.
(b) State Archimedes' principle.
(c) When does an object float or sink when placed on the surface of a liquid ?

5565.

Why dies a goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal?

Answer» Why dies a goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal?
5566.

When the incident rays are not parallel the which of the following parameters will be different when the incident rays are parallel1.focus 2.radius of curvature3.principal axis4.pole

Answer» When the incident rays are not parallel the which of the following parameters will be different when the incident rays are parallel
1.focus
2.radius of curvature
3.principal axis
4.pole
5567.

a block of mass 1kg moving on a horizantal surface with speed 2m/s enters a rough patch ranging from x=0.01m to x=2.01m.The retarding force,Fr on the block in the range is inversely proportional to x over the range. Fr=-k/x 0.1

Answer» a block of mass 1kg moving on a horizantal surface with speed 2m/s enters a rough patch ranging from x=0.01m to x=2.01m.The retarding force,Fr on the block in the range is inversely proportional to x over the range. Fr=-k/x 0.1
5568.

China's position as the "factory of the world" could be under threat as widespread calls to increase workers' wages in the face of rising inflationary pressures push factories to consider relocating outside the country, analysts said. The direct impact on the petrochemicals sector was relatively minor, though calls of wage hikes from sectors such as the electronics and consumer goods that attract scores of migrant workers would compel manufacturers to relook their business models. A few cities in China have already begun to raise minimum wages, with many more cities and provinces to follow suit in the coming weeks, amid concerns that factory owners in China were underpaying their workers. In China's southern manufacturing hub of Shenzhen, the local labor department recently announced that it would raise minimum wages by 10-22% to Yuan (CNY) 1100 ($161) per month from July 2010, while the Beijing municipal government earlier announced a 20% rise in the minimum wage in the city to CNY960 a month. "We expect the forthcoming wage increase to be around 20% in most provinces and cities?" said Jun Ma, chief economist of the greater China region at Deutsche Bank in Hong Kong. An increase in wages may cause a big dent in the cost of doing business of downstream industries that are more labor intensive such as textiles and toy manufacturers, analysts said. "Workers' salaries in these smaller downstream factories make up 10-15% of their costs so any enforced increase could push them out to cheaper countries like Vietnam, Bangladesh, Sri Lanka and India," said Danny Ho, a petrochemical analyst at brokerage firm Yuanta Securities. A 10% wage increase in low-end, labor-intensive sectors including apparel and electronic components could push up China's consumer price index (CPI) by 0.4% and reduce employment by 700,000 jobs, Ma of Deutsche Bank said. "At the sector level, electronic components, apparel, furniture, and auto parts are most obvious victims of wage inflation," he added. Foxconn, which manufactures products for companies such as Apple and Dell, has been criticized over its labor practices after a number of suicides at two Foxconn facilities in southern China. The company's recent move to increase the wages of its workers came amid continuing signs of worker unrest in southern China. Officials in China are very concerned about the social impact of the strikes and are placing pressure on low-end manufacturers to raise wages, Ma of Deutsche Bank said. Recent comments from Premier Wen Jiabao on improving "social justice" would also imply that the government was looking at more aggressive measures to improve the wages of low-income workers in China, he said. "The faster-than-expected labor cost increase has now become a political imperative," Ma added. Rising labor costs in China in the long term would help change the country's manufacturing mix and upgrade its economy, analysts said, adding that it would also help reduce the income gap in the country. Q43. China can lose the tag "factory of the world" because

Answer»

China's position as the "factory of the world" could be under threat as widespread calls to increase workers' wages in the face of rising inflationary pressures push factories to consider relocating outside the country, analysts said. The direct impact on the petrochemicals sector was relatively minor, though calls of wage hikes from sectors such as the electronics and consumer goods that attract scores of migrant workers would compel manufacturers to relook their business models.

A few cities in China have already begun to raise minimum wages, with many more cities and provinces to follow suit in the coming weeks, amid concerns that factory owners in China were underpaying their workers. In China's southern manufacturing hub of Shenzhen, the local labor department recently announced that it would raise minimum wages by 10-22% to Yuan (CNY) 1100 ($161) per month from July 2010, while the Beijing municipal government earlier announced a 20% rise in the minimum wage in the city to CNY960 a month.

"We expect the forthcoming wage increase to be around 20% in most provinces and cities?" said Jun Ma, chief economist of the greater China region at Deutsche Bank in Hong Kong. An increase in wages may cause a big dent in the cost of doing business of downstream industries that are more labor intensive such as textiles and toy manufacturers, analysts said. "Workers' salaries in these smaller downstream factories make up 10-15% of their costs so any enforced increase could push them out to cheaper countries like Vietnam, Bangladesh, Sri Lanka and India," said Danny Ho, a petrochemical analyst at brokerage firm Yuanta Securities.

A 10% wage increase in low-end, labor-intensive sectors including apparel and electronic components could push up China's consumer price index (CPI) by 0.4% and reduce employment by 700,000 jobs, Ma of Deutsche Bank said. "At the sector level, electronic components, apparel, furniture, and auto parts are most obvious victims of wage inflation," he added.

Foxconn, which manufactures products for companies such as Apple and Dell, has been criticized over its labor practices after a number of suicides at two Foxconn facilities in southern China. The company's recent move to increase the wages of its workers came amid continuing signs of worker unrest in southern China. Officials in China are very concerned about the social impact of the strikes and are placing pressure on low-end manufacturers to raise wages, Ma of Deutsche Bank said.

Recent comments from Premier Wen Jiabao on improving "social justice" would also imply that the government was looking at more aggressive measures to improve the wages of low-income workers in China, he said. "The faster-than-expected labor cost increase has now become a political imperative," Ma added. Rising labor costs in China in the long term would help change the country's manufacturing mix and upgrade its economy, analysts said, adding that it would also help reduce the income gap in the country.

Q43. China can lose the tag "factory of the world" because


5569.

Is possible in an atom to have 12 protons and 13 electrons

Answer» Is possible in an atom to have 12 protons and 13 electrons
5570.

Question 7 Rocket works on the principle of conservation of (a) mass (b) energy (c) momentum (d) velocity

Answer» Question 7
Rocket works on the principle of conservation of

(a) mass
(b) energy
(c) momentum
(d) velocity
5571.

A bullet of mass 4g when fired with a velocity of 50m/s can enter a wall upto a depth of 10cm. How much will be the average resistance offered by the wall.

Answer»

A bullet of mass 4g when fired with a velocity of 50m/s can enter a wall upto a depth of 10cm. How much will be the average resistance offered by the wall.

5572.

The minute hand of a clock is 14 cm long. find the displacement and distance covered by it from 11:00 a.m. to 11:30 a.m.

Answer»

The minute hand of a clock is 14 cm long. find the displacement and distance covered by it from 11:00 a.m. to 11:30 a.m.

5573.

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept almg the same principle axis with a distance d between them. Ig a parallel beam of light falling on A leaves B parallely, then the distance in cm will be?

Answer» A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept almg the same principle axis with a distance d between them. Ig a parallel beam of light falling on A leaves B parallely, then the distance in cm will be?
5574.

An electric iron of 1000 W is used for 2 hr per day. Calculate the ‘units’ of energy consumed in one month by the electric iron.

Answer» An electric iron of 1000 W is used for 2 hr per day. Calculate the ‘units’ of energy consumed in one month by the electric iron.
5575.

For dissolution of gases in liquids, theconcentration of a gas in liquid isproportional to the pressure(concentration) of the gas over the liquid.what does "pressure (concentration) of the gas over the liquid." exactly mean?

Answer» For dissolution of gases in liquids, the
concentration of a gas in liquid is
proportional to the pressure
(concentration) of the gas over the liquid.
what does "pressure (concentration) of the gas over the liquid." exactly mean?
5576.

A particle retards from a velocity u while moving in a straight line. If the magnitude of deacceleration is directly proportional to the square root of speed of particle, find its average velocity for total time of its motion.

Answer» A particle retards from a velocity u while moving in a straight line. If the magnitude of deacceleration is directly proportional to the square root of speed of particle, find its average velocity for total time of its motion.
5577.

In the figure shown, battery 1 has emf=6 V and internal resistance =1 Ω. Battery 2 has emf=2 V and internal resistance =3 Ω. The wires have negligible resistance. What is the potential difference across the terminals of battery 2?

Answer»

In the figure shown, battery 1 has emf=6 V and internal resistance =1 Ω. Battery 2 has emf=2 V and internal resistance =3 Ω. The wires have negligible resistance. What is the potential difference across the terminals of battery 2?




5578.

When a force is exerted on an object, it can change its:

Answer»

When a force is exerted on an object, it can change its:


5579.

How far would you travel moving at 12 m/s for 3.00 minutes?

Answer»

How far would you travel moving at 12 m/s for 3.00 minutes?


5580.

A stone weighing 200 g is dropped in the given beaker, the water level in it rises to 400 ml. What would have been the rise in water level if a stone weighing 300 g would have been dropped in the beaker?

Answer» A stone weighing 200 g is dropped in the given beaker, the water level in it rises to 400 ml. What would have been the rise in water level if a stone weighing 300 g would have been dropped in the beaker?


5581.

The area of the cross-section of the wider tube shown in the figure is 900 cm2. If the boy standing on the piston weighs 45 kg, find the difference in the levels of water in the two tubes. Density of water = 1000 kg/m3

Answer»

The area of the cross-section of the wider tube shown in the figure is 900 cm2. If the boy standing on the piston weighs 45 kg, find the difference in the levels of water in the two tubes. Density of water = 1000 kg/m3


5582.

Liquids are compressible or not. Please give verified answer

Answer»

Liquids are compressible or not. Please give verified answer

5583.

what is the exact meaning of refraction?

Answer» what is the exact meaning of refraction?
5584.

37.A person travelling on a straight line moves with uniform velocity v1 for a distance X and with a uniform velocity v2 for the next equal distance the average velocity v is given byTPZBAND

Answer» 37.A person travelling on a straight line moves with uniform velocity v1 for a distance X and with a uniform velocity v2 for the next equal distance the average velocity v is given byTPZBAND
5585.

An object is placed at a distance of 25 cm from the convex mirror and a plane mirror is set such that the image formed by the two mirrors coincide. The plane mirror is placed at 20 cm from the object. The radius of curvature of the convex mirror will be

Answer»

An object is placed at a distance of 25 cm from the convex mirror and a plane mirror is set such that the image formed by the two mirrors coincide. The plane mirror is placed at 20 cm from the object. The radius of curvature of the convex mirror will be




5586.

what happens when applied voltage across a zener voltage is less than applied voltag

Answer» what happens when applied voltage across a zener voltage is less than applied voltag
5587.

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6×1024 kg and radius of the earth is 6.4×106 m)

Answer» What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6×1024 kg and radius of the earth is 6.4×106 m)
5588.

Minimum angle at which a pushing force should be applied t so that it can move a body ?explain and derive the equation

Answer» Minimum angle at which a pushing force should be applied t so that it can move a body ?
explain and derive the equation
5589.

A boat having a length of 3 and breadth 2 metre is floating on a lake. the boat sinks by one cm when a man gets own it. the mass of the man is?

Answer»

A boat having a length of 3 and breadth 2 metre is floating on a lake. the boat sinks by one cm when a man gets own it. the mass of the man is?

5590.

In the following figure, the separation between the plates 2d=7 mm, plate area A=56 cm2 and dielectric constant k=10. If the emf of the battery connected is 1 kV, then the charge on the capacitor is(Take ϵo=9×10−12 F/m)

Answer»

In the following figure, the separation between the plates 2d=7 mm, plate area A=56 cm2 and dielectric constant k=10. If the emf of the battery connected is 1 kV, then the charge on the capacitor is

(Take ϵo=9×1012 F/m)


5591.

The variation of acceleration due to gravity g with distance d from centre of the earth is best represented by(R= Earth’s radius) :

Answer»

The variation of acceleration due to gravity g with distance d from centre of the earth is best represented by

(R= Earth’s radius) :

5592.

34.What should be the velocity of the electron present in the fourth orbit of hydrogen atom, if the velocity of the electron present in its first orbit 2

Answer» 34.What should be the velocity of the electron present in the fourth orbit of hydrogen atom, if the velocity of the electron present in its first orbit 2
5593.

Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you ?

Answer»

Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you ?

5594.

A container of a large uniform cross-sectional area A resting on a horizontal surface holds two immiscible, non-viscous and incompressible liquids of densities d and 2d, each of height H2 as shown in figure. The lower denisty liquid is open to the atomsphere. A homogenous solid cylinder of length L(L<H2), cross-sectional area A5 is immersed such that it floats with its axis vertical to the liquid-liquid interface with length L4 in the denser liquid. The density of the solid is

Answer»

A container of a large uniform cross-sectional area A resting on a horizontal surface holds two immiscible, non-viscous and incompressible liquids of densities d and 2d, each of height H2 as shown in figure. The lower denisty liquid is open to the atomsphere. A homogenous solid cylinder of length L(L<H2), cross-sectional area A5 is immersed such that it floats with its axis vertical to the liquid-liquid interface with length L4 in the denser liquid. The density of the solid is




5595.

Find the work done to take a particle of mass m from surface of the earth to a height equal to 2R -

Answer»

Find the work done to take a particle of mass m from surface of the earth to a height equal to 2R -

5596.

How to find moment of inertia of any body.

Answer» How to find moment of inertia of any body.
5597.

Two trains having length 200 m and 332 m are running in the opposite directions with velocities 54 km/h and 72 km/h. In what time they will completely cross each other?

Answer»

Two trains having length 200 m and 332 m are running in the opposite directions with velocities 54 km/h and 72 km/h. In what time they will completely cross each other?

5598.

7.Why tyre throws mud tangentially?

Answer» 7.Why tyre throws mud tangentially?
5599.

Derive recoil velocity.

Answer» Derive recoil velocity.
5600.

(क) बस के नीचे पहुँचकर छोटे बाघ को अच्छा क्यों नहीं लगा?(ख) क्या तुमने कभी किसी बस या जीप से नीचे झाँककर देखा है? तुम्हें वहाँ क्या दिखाई दिया?(ग) बस के अगले हिस्से से घर्र-घर्र की आवाज़ क्यों आ रही थी?(घ) बस में ज़्यादातर लोग दायीं तरफ़-क्यों बैठे थे?(ङ) बस में इतने सारे लोग बैठे थे पर बाघ का ध्यान दो छोटी लड़कियों पर ही गया। क्यों?

Answer»

(क) बस के नीचे पहुँचकर छोटे बाघ को अच्छा क्यों नहीं लगा?

(ख) क्या तुमने कभी किसी बस या जीप से नीचे झाँककर देखा है? तुम्हें वहाँ क्या दिखाई दिया?

(ग) बस के अगले हिस्से से घर्र-घर्र की आवाज़ क्यों आ रही थी?

(घ) बस में ज़्यादातर लोग दायीं तरफ़-क्यों बैठे थे?

(ङ) बस में इतने सारे लोग बैठे थे पर बाघ का ध्यान दो छोटी लड़कियों पर ही गया। क्यों?