SUB: PHYSICS Test: Class test I

CLASS: ISC-II, PUC-II

**Question 1 **

Whats the **unit of capacitance?**

**Question 2**

What is the **amount of work done** on an **equi-potential surface**?

**Question 3**

Between an **a****-particle** and a **proton** which has **more energy in a 100-Volt region**?

**Question 4**

Which is correct for a **series combination of capacitance**?

(a) C = C1+C2 (b) C = 1/C1 + 1/C2 (c) 1/C = 1/C1 + 1/C2

**Question 5**

**Electric field intensity E** for a **spherical metallic conductor** is

(a) s/e_{0 }(b) 2s/e_{0} (c) 2qs/e_{0}

**Question 6**

For a **Van-de-Graf Generator**

(a**) Outer sphere** is at **higher potential**

(b) **Inner sphere** is at **higher potential**

** **

**Question 7**

(a) **Cyclotron frequency** is proportional to **energy** (b) depends on magnetic field

**Question 8 **

**Angular Momentum L** is an **integral multiple** of which constant?

(a) Fine structure constant

(b) Rydberg Constant

(c) Universal Gas Constant

(d) Planck’s Constant

**Question 9**

**Ground state speed of e ^{–}** in the

**H-atom**in terms of speed-of-light c is

(a) c/137 (b) c.137 (c) a.c/137 (d) c/10

**Question 10 **

Whats the energy of H-atom according to Niels Bohr?

(a) -13.61/n^{2} eV (b) +13.61/n^{2} eV (c) -13.61/n eV (d) -13.61 eV

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SUB: PHYSICS Test: Class test II

CLASS: ISC-II, PUC-II

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**Question 1 **

Which property of the charge is valid?

(a) Charge is a Vector quantity

(b) Conservation of quantity of charge

(c) flux of charge outside a Gaussian surface is conserved.

**Question 2**

Which is the drawback of Rutherford’s model?

(a) Atomic instability due to radiative energy loss.

(b) Line spectrum of H-atom is inexplicable.

(c) Can’t explain H-atom.

**Question 3**

Which are drawbacks of Bohr’s theory?

(a) Can’t explain Balmer series (b) Can’t explain atomic stability (c) Can’t explain N-spectrum.

**Question 4**

Write out the relation between e, e_{r}, e_{0}.

**Question 5**

If dielectric material of dielectric constant K is introduced in a space, which is reduced E, V or Q?

**Question 6 **

**Half life **of **Ra is x hrs** of **N is y hrs** where **x < y**. If we start with 1000 of each which is available in less quantity **after an hour**?

**Question 7 **

Which is used **in a nuclear reactor as a moderator material** and why?

**Question 8 **

**Energy of radiation** b/w **H-atom levels, n=2, n = 3**?

**Question 9 **

Write the **charge** (in units of **electron’s charge e**) and **mass** (**in units of amu = u**) of **proton**, **e**, **a**, ^{12}C_{6} .