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6851.

The current supplied by the battery in the circuit shown in figure is

Answer»

The current supplied by the battery in the circuit shown in figure is




6852.

A cylinder of radius R=1 m and height H=3 m two-thirds filled with water, is rotated about its vertical axis as shown in Figure. Determine the speed of rotation when the water just starts spilling over the rim.

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A cylinder of radius R=1 m and height H=3 m two-thirds filled with water, is rotated about its vertical axis as shown in Figure. Determine the speed of rotation when the water just starts spilling over the rim.




6853.

A body of weight 72 N moves from the surface of earth to a height equal to half the radius of earth. Gravitational force will be

Answer»

A body of weight 72 N moves from the surface of earth to a height equal to half the radius of earth. Gravitational force will be

6854.

A small block of mass m is taken slowly up a fixed hemisphere from P to Q and then slowly down along its surface from Q to S by force F,which at each point of the surface ,is tangential to the surface .if the coefficient of friction is mu,then the work performed by the force in taking the block from P to S along the hemispherical surface of radius R. take P,Q AND S in anticlockwise way.

Answer» A small block of mass m is taken slowly up a fixed hemisphere from P to Q and then slowly down along its surface from Q to S by force F,which at each point of the surface ,is tangential to the surface .if the coefficient of friction is mu,then the work performed by the force in taking the block from P to S along the hemispherical surface of radius R. take P,Q AND S in anticlockwise way.
6855.

Which of the following involves the application of a force?

Answer»

Which of the following involves the application of a force?



6856.

A stone is dropped from the top of a tower and travels with a velocity of 24.5m/s in the last second of its journey. Calculate the height of the tower

Answer» A stone is dropped from the top of a tower and travels with a velocity of 24.5m/s in the last second of its journey. Calculate the height of the tower
6857.

Name the property of earth which is responsible for extremely small acceleration being produced in it as a result of attraction by other small objects.

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Name the property of earth which is responsible for extremely small acceleration being produced in it as a result of attraction by other small objects.

6858.

If there is a tunnel made from North Pole to South Pole. Then, a ball is dropped from North Pole , How will it go to South Pole?

Answer» If there is a tunnel made from North Pole to South Pole. Then, a ball is dropped from North Pole , How will it go to South Pole?
6859.

A prestressed concrete simply supported beam of span 6 m has a rectangular cross-section 300 x 600 mm and unit weight 24 kN/m3. The resultant prestressing tendon has zero eccentricity at ends and an eccentricity, e, at midspan, and linear profile. Under initial condition, the allowable stresses are 20 N/mm2 in compression and 2 N/mm2 in tension. Using this condition, determine the prestressing force, P, and the eccentricity, e, at midspan. The imposed loading is a single concentrated load, W, at midspan and the tendon undergoes loss in prestress of 25%. Determine W, if the final allowable stresses in compression and tension are not to exceed 15 N/mm2 and 1 N/mm2 respectively.

Answer» A prestressed concrete simply supported beam of span 6 m has a rectangular cross-section 300 x 600 mm and unit weight 24 kN/m3. The resultant prestressing tendon has zero eccentricity at ends and an eccentricity, e, at midspan, and linear profile. Under initial condition, the allowable stresses are 20 N/mm2 in compression and 2 N/mm2 in tension. Using this condition, determine the prestressing force, P, and the eccentricity, e, at midspan. The imposed loading is a single concentrated load, W, at midspan and the tendon undergoes loss in prestress of 25%. Determine W, if the final allowable stresses in compression and tension are not to exceed 15 N/mm2 and 1 N/mm2 respectively.
6860.

Mention five characteristics of sound waves? [5 MARKS]

Answer»

Mention five characteristics of sound waves? [5 MARKS]

6861.

Q. The position of particle along X-axis is given by x = 4 – 2t + t2. The speed of particle is shown by which v-t graph?

Answer» Q. The position of particle along X-axis is given by x = 4 – 2t + t2. The speed of particle is shown by which v-t graph?
6862.

Calculate the value of the electric current (i) in the following circuit.

Answer»

Calculate the value of the electric current (i) in the following circuit.

6863.

What is the direction of the earth’s rotation?

Answer»

What is the direction of the earth’s rotation?


6864.

A bus appears to go with a speed of 25 km/hr to a car driver, driving at the rate 7 km/hr northwards. If thebus actually travels in east direction, its speed is (1) 24km/h (2)23km/h (3)26km/h (4)30km/h

Answer» A bus appears to go with a speed of 25 km/hr to a car driver, driving at the rate 7 km/hr northwards. If thebus actually travels in east direction, its speed is (1) 24km/h (2)23km/h (3)26km/h (4)30km/h
6865.

What do we call, 'mass of a body per unit volume'?

Answer»

What do we call, 'mass of a body per unit volume'?



6866.

Prove that 0/0 =2

Answer»

Prove that 0/0 =2

6867.

velocity of sound in air

Answer» velocity of sound in air
6868.

A Kundt's tube apparatus has a copper rod of length 1.0 m clamped at 25 cm from one of the ends. The tube contains air in which the speed of sound is 340 m/s. The powder collects in heaps seperated by a distance of 10.0 cm. Find the speed of sound waves in copper.

Answer»

A Kundt's tube apparatus has a copper rod of length 1.0 m clamped at 25 cm from one of the ends. The tube contains air in which the speed of sound is 340 m/s. The powder collects in heaps seperated by a distance of 10.0 cm. Find the speed of sound waves in copper.

6869.

143.the moment of inertia of rectangular plate of lekgth-a and width-b about the axis of rotation passing through its centre and perpendicular to its plane

Answer» 143.the moment of inertia of rectangular plate of lekgth-a and width-b about the axis of rotation passing through its centre and perpendicular to its plane
6870.

In which medium sound travels fastest: air, water or steel?

Answer»

In which medium sound travels fastest: air, water or steel?

6871.

According to Newton's Law of Gravitation:

Answer»

According to Newton's Law of Gravitation:


6872.

A car travels (14)th of a circular path with radius r. Find the ratio of the distance to its displacement.

Answer»

A car travels (14)th of a circular path with radius r. Find the ratio of the distance to its displacement.



6873.

138. If we increase the speed of a body then what will be the effect of mass on the body it will change or not?

Answer» 138. If we increase the speed of a body then what will be the effect of mass on the body it will change or not?
6874.

Why does an iron nail sink in water, whereas a ship made of iron float?

Answer» Why does an iron nail sink in water, whereas a ship made of iron float?
6875.

Stone dropped in a well hits water surface after 2 sec. What is the depth of well and with what speed will the stone hit the water surface?

Answer»

Stone dropped in a well hits water surface after 2 sec. What is the depth of well and with what speed will the stone hit the water surface?

6876.

1.the kinetic energy of a body is increased by 300%. the momentum of the body would increase by a.50% b.100% c. 150% d.300%

Answer» 1.the kinetic energy of a body is increased by 300%. the momentum of the body would increase by a.50% b.100% c. 150% d.300%
6877.

A stone of 1 kg is thrown with a velocity of 20 ms−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

Answer»

A stone of 1 kg is thrown with a velocity of 20 ms1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?


6878.

Give names of the parts which are not detecting in MRI.Why they are not detecting ? Explain with reason also.

Answer» Give names of the parts which are not detecting in MRI.Why they are not detecting ? Explain with reason also.
6879.

35. How to identify any element have vacant p-orbital or d-orbital?Like silicon have vacant d-orbital

Answer» 35. How to identify any element have vacant p-orbital or d-orbital?Like silicon have vacant d-orbital
6880.

An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by two mirrors. The radius of curvature of the mirror will be-

Answer»

An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by two mirrors. The radius of curvature of the mirror will be-

6881.

An equiconvex lens is made from glass of refractive index 1.5. If the radius of each surface is changed from 5 cm to 6 cm,then the power- (a) decreased by 3.33D. (b) increase by 3.33 D

Answer» An equiconvex lens is made from glass of refractive index 1.5. If the radius of each surface is changed from 5 cm to 6 cm,then the power- (a) decreased by 3.33D. (b) increase by 3.33 D
6882.

25. How to find distance b/w two points ?

Answer» 25. How to find distance b/w two points ?
6883.

Clarify the differencesA. Distance and displacementB. Uniform and non-uniform motion.

Answer»
Clarify the differences


A. Distance and displacement


B. Uniform and non-uniform motion.
6884.

Petroleum is a fossil fuel, then when it is used as a fuel in our vehicles ,why does it not leave ashes?

Answer» Petroleum is a fossil fuel, then when it is used as a fuel in our vehicles ,why does it not leave ashes?
6885.

What are electric resistance

Answer» What are electric resistance
6886.

A man is moving down on the curved surface y^{2 }=9x/2 with cons†an t speed 50 m/s and rain drops vertically downward with velocity 30 m/s w.r.t. ground as shown . What isThe direction of umbrella when man is at x=2.

Answer» A man is moving down on the curved surface y^{2 }=9x/2 with cons†an t speed 50 m/s and rain drops vertically downward with velocity 30 m/s w.r.t. ground as shown . What isThe direction of umbrella when man is at x=2.
6887.

A bullet of 10 g strikes a sand bag at a speed of 1000 m/s and gets embedded after travelling 5 cm. Calculate a) the resistive force exerted by the sand on the bullet. b) the time taken by the bullet to come to rest.

Answer»

A bullet of 10 g strikes a sand bag at a speed of 1000 m/s and gets embedded after travelling 5 cm.
Calculate a) the resistive force exerted by the sand on the bullet.
b) the time taken by the bullet to come to rest.

6888.

The major constituents of an ecosystem are ____ and ____.

Answer»

The major constituents of an ecosystem are ____ and ____.



6889.

a ball dropped from the top of tower falls first half height of tower in 10s .the total time spend by ball in air is

Answer» a ball dropped from the top of tower falls first half height of tower in 10s .the total time spend by ball in air is
6890.

The least count of a vernier calliper is 0.01 cm and its zero error is – 0.03 cm. While measuring the length of a rod, the main scale reading is 4.6 cm and 8th division on vernier scale is in line with a marking on the main scale. Calculate the length of the rod.

Answer»

The least count of a vernier calliper is 0.01 cm and its zero error is – 0.03 cm. While measuring the length of a rod, the main scale reading is 4.6 cm and 8th division on vernier scale is in line with a marking on the main scale. Calculate the length of the rod.


6891.

Time varying torque 4t Nm is applied on an object about pivot. Change in angular momentum of body at time t = 3 s is (1) 8 kg m/s (2) 4 kg m/s (3) 18 kg m/s (4) 12 kg m/s

Answer» Time varying torque 4t Nm is applied on an object about pivot. Change in angular momentum of body at time t = 3 s is (1) 8 kg m/s (2) 4 kg m/s (3) 18 kg m/s (4) 12 kg m/s
6892.

If the density of a certain gas at 30^° C and768 torr is 1.35 kg/m3 its density at STP would be

Answer» If the density of a certain gas at 30^° C and768 torr is 1.35 kg/m3 its density at STP would be
6893.

A light ball falling on the ground, after striking rises upwards.Explain the reason

Answer»

A light ball falling on the ground, after striking rises upwards.Explain the reason

6894.

44.when the series combination of resistors r1 and r2 is connected with a cell of emf 4.2 volt and internal resistance 1 ohm , the terminal potential difference across the cell is 3.78 volt . when the parallel combination of same resistors is connected with same cell , the terminal potenial difference across the cell is 2.3 volt .Find the resistance r1 and r2

Answer» 44.when the series combination of resistors r1 and r2 is connected with a cell of emf 4.2 volt and internal resistance 1 ohm , the terminal potential difference across the cell is 3.78 volt . when the parallel combination of same resistors is connected with same cell , the terminal potenial difference across the cell is 2.3 volt .Find the resistance r1 and r2
6895.

nt nttA:Since ,matter cannot be concentrated at a point, therefore point charge is not possible.nt nttR:An electron is a point charge.nt nttnt nttExplain the assertion and reasonnn

Answer» nt nttA:Since ,matter cannot be concentrated at a point, therefore point charge is not possible.nt nttR:An electron is a point charge.nt nttnt nttExplain the assertion and reasonnn
6896.

When free ends of conductivity tester are dipped into a solution the magnetic needle shows deflection?explain

Answer»

When free ends of conductivity tester are dipped into a solution the magnetic needle shows deflection?explain

6897.

A non-zero force is acting on a body but work done is zero. Which of the following statements justify the above situation?1. Distance moved is zero.2. Force is perpendicular to the direction of motion.3. Force is in the direction of motion.4. Force is opposite to the direction of motion.

Answer»

A non-zero force is acting on a body but work done is zero. Which of the following statements justify the above situation?



1. Distance moved is zero.

2. Force is perpendicular to the direction of motion.

3. Force is in the direction of motion.

4. Force is opposite to the direction of motion.



6898.

From a tower of height H a particle is thrown vertically upwards with a speed u the time taken by particle to hit the ground is a n times that taken by it to reach the highest point of its path the relation between H,u and n

Answer» From a tower of height H a particle is thrown vertically upwards with a speed u the time taken by particle to hit the ground is a n times that taken by it to reach the highest point of its path the relation between H,u and n
6899.

What are the ammeter (A) and voltmeter (V) readings in the circuit?

Answer»

What are the ammeter (A) and voltmeter (V) readings in the circuit?




6900.

Among the three scuba divers, who will experience the highest liquid pressure?

Answer»

Among the three scuba divers, who will experience the highest liquid pressure?