Bihar Board Physics Exam Answer Key 2019 Set-D
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- The resistance of an ideal ammeter is- Zero
- Light owes its color to its- Frequency
- The Boolean expression for NAND gate is- Y = A.B
- The wavefront due to the point source at a finite distance from the source is- Spherical
- The height of a TV tower at a certain places to 245m the maximum distance up to which its program can be received is- 56Km
- In an alternating current circuit the phase difference between current and voltage is V then the wattless component of current will be –1 SINϕ Option C
- Equivalent focal length of two lens in contact having power- 15 D and + 5D will be – (-)10
- Deviation of a thin prism of refractive index n and angle of prism A is- -(n-1)A
- A Convex lens made from such material which refractive index is 1.5. This lens is immersed in water (u=1.33), then behaves like as- Converging Lens
- Unit of surface charge density is – Cm–2
- With the increase of temperature resistivity of semiconductor –Decreases
- The Solar spectrum is- Continuous
- The magnifying power of an astronomical telescope for normal adjustment is – Option A
- When two bulbs of power 60w and 40w are connected in series then power of the combination will be – 24W
- Electric potential in an equatorial position of an electric dipole is- Zero
- If Q is equal to charge is placed inside in a spherical surface then total flux coming out from the whole surface will be- q/ E0
- The torque experienced by a current loop of magnetic moment M placed in a magnetic field is – M*B Option A
- At constant potential difference resistance of an electric circuit is half the value of heat produced will be Double / Two times
- The energy of a photon of wavelength λ is – hc/λ
- The time in which radioactive substance become half of its initial amount is called – Half-Life
- The Stored energy of capacitor changed to 100 volt is 1-joule capacitance of the capacitor is-2×10-4 F
- Cylindrical lenses are used to correct eye defect called- Astigmatism
- In Earth’s magnetic field Bh a frequency of oscillation of magnetic needle is in then –N2 α Bh (B)
- Two point charges of class 10 and minus 10 are placed at a distance 40 cm and potential energy of a system will be -25J
- The susceptibility of a paramagnetic substance is – Constant
- The direction of propagation of the electromagnetic wave is – Option D
- The value of an angle of dip at Earth’s magnetic pole is- 90 Degree
- The current flowing in the wire is one ampere is a charge of an electron is 1.6×10^19 coulombs the number of electrons flowing through wire per second is – 6.25*10^18
- Which one of the following has a maximum refractive index – Diamond
- The ratio of root mean square value and peak value of alternating current is – 1√2(Option B)
- The modulation index in an Amplitude Modulation- Lies between zero and 1
- Working of the dynamo is based on the principle of-Electromagnetic Induction
- Power of an electric circuit is – V2/R
- The power of an l-r circuit is – B
- In a step up Transformer number of turns in primary and secondary cells and N1 and N2 then- N2>N1