A metallic bond differs form a covalent bond in that

it is not directional
it is not saturable
the valence electrons are not attached to any particular atom
all of the above

A point particle of mass 0.1 kg is executing S.H.M. of amplitude of 0.1 m. When the particle passes through the mean position, its kinetic energy is 8 × 10^–3 Joule.Obtain the equation of motion of this particle if this initial phase of oscillation is 45º.

\(y=0.1sin\left ( \pm 4t+\frac{\pi }{4} \right )\)
\(y=0.2sin\left ( \pm 4t+\frac{\pi }{4} \right )\)
\(y=0.2sin\left ( \pm 4t+\frac{\pi }{4} \right )\)
\(y=0.2sin\left ( \pm 2t+\frac{\pi }{4} \right )\)

Solution

In Hydrogen spectrum, the wavelength of H_α line is 656 nm, whereas in the spectrum of a distant galaxy, H_α line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is

2 × 10₈m/s
2 × 10₇m/s
2 × 10⁶m/s
2 × 10⁵m/s

Solution

An uncharged sphere of metal is placed in between charged plates as shown. The lines of force look like

Solution

Electric lines of force never intersect the conductor.They are perpendicular and slightly curved near the surface of conductor.

An open and closed organ pipe have the same length. The ratio of pth mode of frequency of vibration of two pipes is

1
p
p (2p + 1)
\(\frac{2p}{(2p-1)}\)

Solution

If the frequency of K_α X-rays emitted from the element with atomic number 31 is v, then the frequency of K_α X-rays emitted from the element with atomic number 51 would be

⁵⁄₃v
⁵¹⁄₃₁v
²⁷⁄₉v
⁹⁄₂₅v

Solution

An electron (mass =9 × 10^–31kg, charge =1.6 × 10^–19C)moving with a velocity of 10⁶m/s enters a magnetic field. If it describes a circle of radius 0.1m, then strength of magnetic field must be

4.5 × 10^–5 T
1.4 × 10^–5 T
5.5 × 10^–5 T
2.6 × 10^–5 T

Solution

The mutual inductance of a pair of coils, each of N turns, is M henry. If a current of I ampere in one of the coils is brought to zero in t second, the emf induced per turn in the other coil, in volt,will be

\(\frac{MI}{t}\)
\(\frac{NMI}{t}\)
\(\frac{MI}{It}\)
\(\frac{MI}{Nt}\)

Solution

A nicol prism is based on the action of

refraction
double refraction
dichroism
both (b) and (c)

Solution

When a ray of light enters nicol prism, it splits into two plane polarised light in mutually perpendicular direction. One of this light undergoes total reflection and absorption where as other comes out as a plane polarised light.

A particle of mass m₁ moving with velocity v collides with a mass m₂ at rest, then they get embedded. Just after collision, velocity of the system

increases
decreases
remains constant
becomes zero

Solution

The ratio of mean value over half cycle to r.m.s. value of A.C. is

2: π
2√2 : π
√2 : π
√2 : 1

Solution

The rest energy of an electron is

510 KeV
931 KeV
510 MeV
931 MeV

Solution

The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds it starts rotating at 4500 revolutions per minute. The angular acceleration of the wheel is

30 radian /second²
1880 degrees/ second²
40 radian / second²
1980 degree/second²

Solution

DIRECTION: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement-1 : The ferromagnetic substance do not obey Curie’s law.

Statement-2 :At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

(a)Statement -1 is false, Statement-2 is true
(b)Statement -1 is true, Statement-2 is true; Statement -2 is a correct explanation for Statement-1
(c)Statement -1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1
(d)Statement -1 is true, Statement-2 is false

Solution

(c)Statement -1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1

The susceptibility of ferromagnetic substance decreases with the rise of temperature in a complicated manner. After Curies point in the susceptibility of ferromagnetic substance varies in versely with its absolute tempearture. Ferromagnetic substance obey’s Curie’s law only above its Curie point.

A magnetic needle vibrates in a vertical plane parallel to the magnetic meridian about a horizontal axis passing through its centre. Its frequency is n. If the plane of oscillation is turned about a vertical axis by 90°C, the frequency of its oscillation in vertical plane will be

n
zero
less than n
more than n

Solution

UnAttempted

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0

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0

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