Recent questions tagged t10

Which of the following correctly represents the variable of 1/u versus 1/v for a concave mirror?

asked Oct 17, 2017 by priyanka.c

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The magnification of a mirror in the case of a virtual and erect image is

asked Oct 17, 2017 by priyanka.c

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Which of the following figures correctly depicts the reflection of a ray of light on a spherical mirror?

asked Oct 17, 2017 by priyanka.c

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Air is not visible because it

asked Oct 17, 2017 by priyanka.c

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An electric motor operates on a 50V supply and draws a current of 12 A. If the motor yields a mechanical power of 300 W, what is the percentage efficiency of the motor?

asked Oct 17, 2017 by priyanka.c

1 answer

Calculate the current in a wire if a change of 2000 coulomb flows through it in 10 minutes

asked Oct 17, 2017 by priyanka.c

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The metal which has the lowest resistivity is

asked Oct 17, 2017 by priyanka.c

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A charged body at rest produces

asked Oct 17, 2017 by priyanka.c

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In which wire in an AC circuit is the switch introduced to operate the lights?

asked Oct 17, 2017 by priyanka.c

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Which of the following statements are correct? 1. The magnetic lines of force are always continuous loops, so they are endless. 2. The lines of force always starts from the south pole to north pole 3. Soft iron core is generally not preferred for solenoid 4. Force of the moving charge is maximum when it moves perpendicular to the direction pf the magnetic field.

asked Oct 17, 2017 by priyanka.c

1 answer

Name the process associated with acylation of benzene

asked Sep 19, 2017 by meena.p

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In the following reaction, identify the products $Na_2CO_3(aq)+2HCl(aq) \to$ __________

asked Sep 19, 2017 by meena.p

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Which of the following metals does not displace $H_2$ gas from dilute HCl or dilute $H_2SO_4$?

asked Sep 19, 2017 by meena.p

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A hydrocarbon compound burns with a non-luminous flame. Which hydrocarbon type does it indicate?

asked Sep 19, 2017 by meena.p

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Differen Diamond is harder than graphite because of

asked Sep 19, 2017 by meena.p

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Which are the fundamental particles present in the nucleus of an atom ?

asked Sep 19, 2017 by meena.p

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Maximum iron ore is found in which of the following states ?

asked Sep 19, 2017 by meena.p

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The luster of a metal is due to :

asked Sep 19, 2017 by meena.p

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Ethanol reacts with sodium and forms two products. These are

asked Sep 19, 2017 by meena.p

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Which of the following are the characteristics of isotopes of an element? i. Isotopes of an element have same atomic masses ii. Isotopes of an element have same atomic number iii. Isotopes of an element show same physical propertiesr> <biv. Isotopes of an element show same chemical properties

asked Sep 19, 2017 by meena.p

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If concentration of $H^+$ is greater than $1 \times 10^{-7}$ then solution is

asked Sep 19, 2017 by meena.p

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Solvents used for cleaning electronic circuit boards are

asked Sep 19, 2017 by meena.p

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Silver articles becomes black on prolonged exposure to air. This is due to the formation of

asked Sep 19, 2017 by meena.p

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10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. If we take 20 mL of the same solution of NaOH, the amount of HC1 solution (the same solution as before) required to neutralise it will be

asked Sep 19, 2017 by meena.p

1 answer