Two conducting balls each of mass 15 gm and having equal charge on them of 126 μC are suspended by two 1 m long silk threads as shown. The separation between them is 8 cm when they are in equilibrium. When one of the balls is discharged to have half the original charge on each the new equilibrium separation will be –

- a)8 cm
- b)5 cm
- c)12 cm
- d)2 cm

Correct answer is option 'B'. Can you explain this answer?

Ombir answered • 2 hours ago

In the circuit shown, sliding contact is moving with uniform velocity towards right. Its value at some instance is 12. The current in the circuit in the circuit at this instant of time will be –

- a)0.5 A
- b)More than 0.5A
- c)Less than 0.5A
- d)May be less or more than 0.5A depending on the value of L

Correct answer is option 'B'. Can you explain this answer?

Sanjay Kumar answered • 2 hours ago

Find the missing character.

- a)9
- b)13
- c)15
- d)16

Correct answer is option 'D'. Can you explain this answer?

Mehar Chand answered • 2 hours ago

In the first column, 17-11=25-19=6.

In the second column, 12-6=34-28=6.

Let the missing number in the third column be x.

Then, x-8=19-11=8 or x=16.

In the second column, 12-6=34-28=6.

Let the missing number in the third column be x.

Then, x-8=19-11=8 or x=16.

Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is μ, a ray, incident at an angle θ, on the face AB would get transmitted through the face AC of the prism provided.

- a)
- b)
- c)
- d)

Correct answer is option 'A'. Can you explain this answer?

Vijay Singh answered • 2 hours ago

sin θ = μ sin r

sin r

The length of a longest interval in which the function 3 sin x – 4 sin^{3}x is increasing, is

- a)π/3
- b)π/2
- c)3π/2
- d)π

Correct answer is option 'A'. Can you explain this answer?

Rampal answered • 2 hours ago

3 sin x – 4 sin^{3} x = sin 3x which increases for

Tharo Bai asked • 1 hour ago

An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.

The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm^{2} at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.

The wavelengths of various colours is as follows :

Q. It is found that ammeter current remains unchanged (2μA) even when the jockey is moved from the end ‘P’ to the middle point of the potentiometer wire. Assuming all the incident photons eject electron and the power of the light incident is 4 × 10^{–6} W. Then the colour of the incident light is

At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P w.r.t.

additional number of workers x is given by . If the firm employs 25 more workers, then

the new level of production of items is

additional number of workers x is given by . If the firm employs 25 more workers, then

the new level of production of items is

- a)3000
- b)3500
- c)4500
- d)2500

Correct answer is option 'B'. Can you explain this answer?

Jagraj Singh answered • 2 hours ago

Helium gas at 27^{o}C has a volume of 8 L. It is suddenly compressed to a volume of 1 L. The final temperature of the gas will be(γ = 5/3 )

- a)108
^{o}C - b)327
^{o}C - c)627
^{o}C - d)927
^{o}C

Correct answer is option 'D'. Can you explain this answer?

Puran Chand answered • 2 hours ago

T_{1} V_{1} ^{γ-1} = T_{2} V_{2} ^{γ-1}

or 300 (8)^{5/3 - 1} = T_{2} (1)^{5/3 - 1}

T_{2} = 300 {(2)^{3}}^{2/3} = 1200 K

or T_{2} = 927^{o}C

or 300 (8)

T

or T

(Integer Answer Type)

This section contains 6 questions. The answer to each of the questions is a single-digit integer, ranging from 0 to 9.

impedance of the R-C circuit is the time constant (in millisecond) of the circuit is

Correct answer is '4'. Can you explain this answer?

Vinod Kumar Garg answered • 2 hours ago

Sunita Devi asked • 1 hour ago

The decay constant of a radio active substance is 0.173 (years)^{-1}. Therefore :

- a)Nearly 63% of the radioactive substance will decay in (1/0.173) year.
- b)half life of the radio active substance is (1/0.173) year.
- c)one -forth of the radioactive substance will be left after nearly 8 years.
- d)average life of the substance is nearly 5.8 years.

Correct answer is option 'A,C,D'. Can you explain this answer?

Chand Tari asked • 1 hour ago

Which of the following complexes shows ionisation as well as hydrate isomerism ?

- a)[Co(NH
_{3})_{4}(H_{2}O)Cl]Cl_{2} - b)[Co(NH
_{3})_{5}(H_{2}O)](NO_{3})_{3} - c)[Co(NH
_{3})_{4}(H_{2}O)Cl]Br_{2} - d)[Co(NH
_{3})_{4}(H_{2}O)2]Cl_{3}

Correct answer is option 'C'. Can you explain this answer?

Kamlesh asked • 1 hour ago

Statement-1 : When a beam of highly energetic neutrons is incident on a tungsten target, no X-rays will be produced.

Statement-2 : Neutrons do not exert any electrostatic force on electrons or nucleus of an atom.

- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
- b)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True.

Correct answer is option 'D'. Can you explain this answer?

Kamla Devi asked • 1 hour ago

A metallic charged ring is placed in a uniform magnetic field with its plane perpendicular to the field. If the magnitude of field starts increasing with time, then :

- a)the ring starts translating
- b)the ring starts rotating about its axis
- c)the ring starts rotating about a diameter
- d)current starts flowing in the ring

Correct answer is option 'D'. Can you explain this answer?

Ram Ratti asked • 1 hour ago

Statement-1 : In process of photoelectric emission, all emitted electrons donot have same kinetic energy.

Statement-2 : If radiation falling on photosensitive surface of a metal consists of different wavelengths, then energy acquired by electrons absorbing photons of different wavelengths shall be different.

- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
- b)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True.

Correct answer is option 'B'. Can you explain this answer?

Jamna Devi asked • 1 hour ago

A metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride. White precipitate on passing of hydrogen sulphide gas is converted into black precipitate. The black precipitate on boiling with hydrogen peroxide (3%) is converted again to a white precipitate which is soluble in ammonium acetate. The cation of the metal nitrate is :

- a)Pb
^{2+} - b)Ag
^{+} - c)Hg
^{2+} - d)Bi
^{3+}

Correct answer is option 'A'. Can you explain this answer?

Bhola Singh asked • 1 hour ago

Statement 1 : The locus represented by xy + yz = 0 is a pair of perpendicular planes.

Statement 2 : If a_{1}x + b_{1}y + c_{1}z + d_{1} = 0 and a2x + b_{2}y + c_{2}z + d_{2} = 0 are perpendicular then a_{1}a_{2} + b_{1}b_{2} + c_{1}c_{2} = 1.

- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
- b)Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True

Correct answer is option 'C'. Can you explain this answer?

Rahul Garg asked • 4 hours ago

A plano convex lens of refractive index µ_{1} and focal length f_{1} is kept in contact with another plano concave lens of refractive index µ_{2} and focal length f_{2}. If the radius of curvature of their spherical faces is R each and f_{1} = 2f_{2}, then µ1 and µ_{2} are related as

- a)µ
_{1}+ µ_{2}= 3 - b)2µ
_{1}– µ_{2}= 1 - c)2µ
_{2}– µ_{1}= 1 - d)3µ
_{2}– 2µ_{1}= 1

Correct answer is option 'B'. Can you explain this answer?

Hari Karthik asked • 6 hours ago

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below.

The logic circuit gate is

The logic circuit gate is

- a)AND gate
- b)NAND gate
- c)NOR gate
- d)OR gate

Correct answer is option 'A'. Can you explain this answer?

Manas Khara asked • 6 hours ago

- Certified Emission Reduction (CER) certificate is an titlement of Carbon Credits
- Transfer of carbon credits is taxable in India

- a)Only 1
- b)Only 2
- c)Both 1 & 2
- d)none of these

Correct answer is option 'C'. Can you explain this answer?

Sunil Kumar asked • 7 hours ago

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion(A): The solution of the differential equation

Reason(R): As the integrating factor of given differential equation is (1/y) .

Assertion(A): The solution of the differential equation

Reason(R): As the integrating factor of given differential equation is (1/y) .

- a)Both Assertion and Reason are true and Reason is the correct explanation of assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.

Correct answer is option 'A'. Can you explain this answer?

Mansi Behl asked • 7 hours ago

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion(A): A variable circle passes through the fixed point A(p,q) and touches x-axis . The locus of the other end of the diameter through A is (x - p)^{2} = 4qy.

Reason(R): An equation of the tangent to the circle x^{2} + y^{2} + 2gx + 2fy + c = 0 at the point (x_{1}, y_{1}) on the circle is xx_{1} - yy_{1} + g(x - x_{1}) + f(y - y_{1}) - c = 0 .

Assertion(A): A variable circle passes through the fixed point A(p,q) and touches x-axis . The locus of the other end of the diameter through A is (x - p)

Reason(R): An equation of the tangent to the circle x

- a)Both Assertion and Reason are true and Reason is the correct explanation of assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.

Correct answer is option 'C'. Can you explain this answer?

Roshani Devi asked • 7 hours ago

Consider the following list of reagents:

Acidified K_{2}Cr_{2}O_{7} , alkaline KMnO_{4} ,CuSO_{4},H_{2}O_{2} ,Cl_{2} ,O_{3},FeCl_{3},HNO_{3} and Na_{2}S_{2}O_{3} .

The total number of reagents that can oxidise aqueous iodide to iodine is

Acidified K

The total number of reagents that can oxidise aqueous iodide to iodine is

Correct answer is '7'. Can you explain this answer?

Sulakhan Singh asked • 7 hours ago

Direction (Q. Nos. 11-13) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Statement II : Radiations emitted go from a lower frequency to higher frequency as the temperature increases.

- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect

Correct answer is option 'A'. Can you explain this answer?

Ram Mohith asked • 7 hours ago

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion(A): If arg(z) < 0, then arg (-z)-arg(z) = -π.

Reason(R): The complex number z satisfying

|z-1| = |z-3| = |z-i| is 2 + 2i.

Assertion(A): If arg(z) < 0, then arg (-z)-arg(z) = -π.

Reason(R): The complex number z satisfying

|z-1| = |z-3| = |z-i| is 2 + 2i.

- a)Both Assertion and Reason are true and Reason is the correct explanation of assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.

Correct answer is option 'D'. Can you explain this answer?

Fetching relevant content for you

Ask a question